[8.x] [Fleet] use @kbn/config-schema in Fleet API (Part 1) (#192883) (#…

…193296)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Fleet] use @kbn/config-schema in Fleet API (Part 1)
(#192883)](#192883)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Julia
Bardi","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-09-18T13:13:21Z","message":"[Fleet]
use @kbn/config-schema in Fleet API (Part 1) (#192883)\n\n##
Summary\r\n\r\nRelates
https://github.com/elastic/kibana/issues/184685\r\n\r\nReadd
#192447 with fixes and tests\r\nto
validate that the response schemas are correct.\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
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use @kbn/config-schema in Fleet API (Part
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use @kbn/config-schema in Fleet API (Part 1) (#192883)\n\n##
Summary\r\n\r\nRelates
https://github.com/elastic/kibana/issues/184685\r\n\r\nReadd
#192447 with fixes and tests\r\nto
validate that the response schemas are correct.\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
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use @kbn/config-schema in Fleet API (Part 1) (#192883)\n\n##
Summary\r\n\r\nRelates
https://github.com/elastic/kibana/issues/184685\r\n\r\nReadd
#192447 with fixes and tests\r\nto
validate that the response schemas are correct.\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common
scenarios","sha":"406f07386ca6b35f375e8f22e682e44c101b1182"}},{"branch":"8.x","label":"v8.16.0","branchLabelMappingKey":"^v8.16.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Julia Bardi <[email protected]>

x-pack/plugins/fleet/common/types/models/agent_policy.ts

@@ -71,7 +71,7 @@ export interface FullAgentPolicyInputStream {
   id: string;
   data_stream: {
     dataset: string;
-    type: string;
+    type?: string;
   };
   [key: string]: any;
 }

x-pack/plugins/fleet/common/types/models/package_policy.ts

@@ -90,6 +90,7 @@ export interface NewPackagePolicy {
     privileges?: {
       cluster?: string[];
     };
+    [key: string]: any;
   };
   overrides?: { inputs?: { [key: string]: any } } | null;
 }