Remove anonymous combinatorial types from cases api spec (#194782)

## Summary

These type definitions cause code generation to fail with one of the
more popular Go generators due to
oapi-codegen/oapi-codegen#1496.


### Checklist

Delete any items that are not applicable to this PR.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [x] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [x] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [x] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [x] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [x] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: kibanamachine <[email protected]>

oas_docs/output/kibana.staging.yaml

@@ -6952,7 +6952,7 @@ paths:
         - $ref: '#/components/parameters/Cases_category'
         - $ref: '#/components/parameters/Cases_defaultSearchOperator'
         - $ref: '#/components/parameters/Cases_from'
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
         - $ref: '#/components/parameters/Cases_page_index'
         - $ref: '#/components/parameters/Cases_page_size'
         - $ref: '#/components/parameters/Cases_reporters'
@@ -7400,7 +7400,7 @@ paths:
       operationId: getCasesByAlertDefaultSpace
       parameters:
         - $ref: '#/components/parameters/Cases_alert_id'
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
       responses:
         '200':
           content:
@@ -7441,7 +7441,7 @@ paths:
         where the cases were created.
       operationId: getCaseConfigurationDefaultSpace
       parameters:
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
       responses:
         '200':
           content:
@@ -7572,7 +7572,7 @@ paths:
                             type: string
                       type: array
                     owner:
-                      $ref: '#/components/schemas/Cases_owners'
+                      $ref: '#/components/schemas/Cases_owner'
                     templates:
                       $ref: '#/components/schemas/Cases_templates'
                     updated_at:
@@ -7620,7 +7620,7 @@ paths:
     post:
       description: >
         Case settings include external connection details, custom fields, and
-        templates.  Connectors are used to interface with external systems. You
+        templates. Connectors are used to interface with external systems. You
         must create a connector before you can use it in your cases. If you set
         a default connector, it is automatically selected when you create cases
         in Kibana. If you use the create case API, however, you must still
@@ -7768,7 +7768,7 @@ paths:
                           type: string
                     type: array
                   owner:
-                    $ref: '#/components/schemas/Cases_owners'
+                    $ref: '#/components/schemas/Cases_owner'
                   templates:
                     $ref: '#/components/schemas/Cases_templates'
                   updated_at:
@@ -7964,7 +7964,7 @@ paths:
                           type: string
                     type: array
                   owner:
-                    $ref: '#/components/schemas/Cases_owners'
+                    $ref: '#/components/schemas/Cases_owner'
                   templates:
                     $ref: '#/components/schemas/Cases_templates'
                   updated_at:
@@ -8073,7 +8073,7 @@ paths:
         returned by this API is unchanged.
       operationId: getCaseReportersDefaultSpace
       parameters:
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
       responses:
         '200':
           content:
@@ -8128,7 +8128,7 @@ paths:
         privileges, depending on the owner of the cases you're seeking.
       operationId: getCaseStatusDefaultSpace
       parameters:
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
       responses:
         '200':
           content:
@@ -8161,7 +8161,7 @@ paths:
         privileges, depending on the owner of the cases you're seeking.
       operationId: getCaseTagsDefaultSpace
       parameters:
-        - $ref: '#/components/parameters/Cases_owner'
+        - $ref: '#/components/parameters/Cases_owner_filter'
       responses:
         '200':
           content:
@@ -45306,11 +45306,8 @@ components:
       name: assignees
       schema:
         oneOf:
-          - type: string
-          - items:
-              type: string
-            maxItems: 100
-            type: array
+          - $ref: '#/components/schemas/Cases_string'
+          - $ref: '#/components/schemas/Cases_string_array'
     Cases_case_id:
       description: >-
         The identifier for the case. To retrieve case IDs, use the find cases
@@ -45327,12 +45324,8 @@ components:
       name: category
       schema:
         oneOf:
-          - example: my-category
-            type: string
-          - items:
-              type: string
-            maxItems: 100
-            type: array
+          - $ref: '#/components/schemas/Cases_case_category'
+          - $ref: '#/components/schemas/Cases_case_categories'
     Cases_comment_id:
       description: >
         The identifier for the comment. To retrieve comment IDs, use the get
@@ -45409,7 +45402,7 @@ components:
       required: true
       schema:
         type: string
-    Cases_owner:
+    Cases_owner_filter:
       description: >
         A filter to limit the response to a specific set of applications. If
         this parameter is omitted, the response contains information about all
@@ -45419,10 +45412,8 @@ components:
       name: owner
       schema:
         oneOf:
+          - $ref: '#/components/schemas/Cases_owner'
           - $ref: '#/components/schemas/Cases_owners'
-          - items:
-              $ref: '#/components/schemas/Cases_owners'
-            type: array
     Cases_page_index:
       description: The page number to return.
       in: query
@@ -45447,11 +45438,8 @@ components:
       name: reporters
       schema:
         oneOf:
-          - type: string
-          - items:
-              type: string
-            maxItems: 100
-            type: array
+          - $ref: '#/components/schemas/Cases_string'
+          - $ref: '#/components/schemas/Cases_string_array'
     Cases_search:
       description: >-
         An Elasticsearch simple_query_string query that filters the objects in
@@ -45467,9 +45455,7 @@ components:
       schema:
         oneOf:
           - $ref: '#/components/schemas/Cases_searchFieldsType'
-          - items:
-              $ref: '#/components/schemas/Cases_searchFieldsType'
-            type: array
+          - $ref: '#/components/schemas/Cases_searchFieldsTypeArray'
     Cases_severity:
       description: The severity of the case.
       in: query
@@ -45526,11 +45512,8 @@ components:
       name: tags
       schema:
         oneOf:
-          - type: string
-          - items:
-              type: string
-            maxItems: 100
-            type: array
+          - $ref: '#/components/schemas/Cases_string'
+          - $ref: '#/components/schemas/Cases_string_array'
     Cases_to:
       description: >
         Returns only cases that were created before a specific date. The date
@@ -45844,7 +45827,7 @@ components:
         index:
           $ref: '#/components/schemas/Cases_alert_indices'
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         rule:
           $ref: '#/components/schemas/Cases_rule'
         type:
@@ -45882,7 +45865,7 @@ components:
           maxLength: 30000
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         type:
           description: The type of comment.
           enum:
@@ -45939,7 +45922,7 @@ components:
             type: string
           type: array
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         pushed_at:
           example: null
           format: date-time
@@ -46082,6 +46065,11 @@ components:
       maxItems: 10
       nullable: true
       type: array
+    Cases_case_categories:
+      items:
+        $ref: '#/components/schemas/Cases_case_category'
+      maxItems: 100
+      type: array
     Cases_case_category:
       description: A word or phrase that categorizes the case.
       maxLength: 50
@@ -46243,7 +46231,7 @@ components:
           example: 66b9aa00-94fa-11ea-9f74-e7e108796192
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         settings:
           $ref: '#/components/schemas/Cases_settings'
         severity:
@@ -46775,7 +46763,7 @@ components:
         description:
           $ref: '#/components/schemas/Cases_case_description'
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         settings:
           $ref: '#/components/schemas/Cases_settings'
         severity:
@@ -46829,7 +46817,7 @@ components:
               example: elastic
               nullable: true
               type: string
-    Cases_owners:
+    Cases_owner:
       description: >
         The application that owns the cases: Stack Management, Observability, or
         Elastic Security.
@@ -46839,6 +46827,10 @@ components:
         - securitySolution
       example: cases
       type: string
+    Cases_owners:
+      items:
+        $ref: '#/components/schemas/Cases_owner'
+      type: array
     Cases_payload_alert_comment:
       type: object
       properties:
@@ -46860,7 +46852,7 @@ components:
                     type: string
                   type: array
             owner:
-              $ref: '#/components/schemas/Cases_owners'
+              $ref: '#/components/schemas/Cases_owner'
             rule:
               type: object
               properties:
@@ -47090,7 +47082,7 @@ components:
         description:
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         settings:
           $ref: '#/components/schemas/Cases_settings'
         severity:
@@ -47159,7 +47151,7 @@ components:
             comment:
               type: string
             owner:
-              $ref: '#/components/schemas/Cases_owners'
+              $ref: '#/components/schemas/Cases_owner'
             type:
               enum:
                 - user
@@ -47189,6 +47181,10 @@ components:
         - description
         - title
       type: string
+    Cases_searchFieldsTypeArray:
+      items:
+        $ref: '#/components/schemas/Cases_searchFieldsType'
+      type: array
     Cases_set_case_configuration_request:
       description: >-
         External connection details, such as the closure type and default
@@ -47275,7 +47271,7 @@ components:
           minItems: 0
           type: array
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         templates:
           $ref: '#/components/schemas/Cases_templates'
       required:
@@ -47294,6 +47290,13 @@ components:
           type: boolean
       required:
         - syncAlerts
+    Cases_string:
+      type: string
+    Cases_string_array:
+      items:
+        $ref: '#/components/schemas/Cases_string'
+      maxItems: 100
+      type: array
     Cases_template_tags:
       description: >
         The words and phrases that help categorize templates. It can be an empty
@@ -47406,7 +47409,7 @@ components:
         index:
           $ref: '#/components/schemas/Cases_alert_indices'
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         rule:
           $ref: '#/components/schemas/Cases_rule'
         type:
@@ -47650,7 +47653,7 @@ components:
           example: 8af6ac20-74f6-11ea-b83a-553aecdb28b6
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         type:
           description: The type of comment.
           enum:
@@ -47710,7 +47713,7 @@ components:
           example: 22fd3e30-03b1-11ed-920c-974bfa104448
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         payload:
           oneOf:
             - $ref: '#/components/schemas/Cases_payload_alert_comment'
@@ -47797,7 +47800,7 @@ components:
             - full_name
             - username
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         payload:
           oneOf:
             - $ref: '#/components/schemas/Cases_payload_alert_comment'
@@ -47842,7 +47845,7 @@ components:
           example: 8af6ac20-74f6-11ea-b83a-553aecdb28b6
           type: string
         owner:
-          $ref: '#/components/schemas/Cases_owners'
+          $ref: '#/components/schemas/Cases_owner'
         pushed_at:
           example: null
           format: date-time