[Automatic Import] Resolve http_endpoint config not loading correctly (…

…#191964)

## Summary

This resolves a regression from
`https://github.com/elastic/kibana/pull/188695` where the http_endpoint
input was also modified together with the rest of the inputs with
multiple words, however `http_endpoint` uses `_` rather than `-` in its
actual name.

While this modifies the API, it is an internal API and under tech
preview. The only consumer of this API is our own UI, which is also
modified in this PR to pass the correct parameter.

### For maintainers

- [x] 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)

x-pack/plugins/integration_assistant/common/api/model/common_attributes.schema.yaml

@@ -109,7 +109,7 @@ components:
         - filestream
         - gcp-pubsub
         - gcs
-        - http-endpoint
+        - http_endpoint
         - journald
         - kafka
         - tcp

x-pack/plugins/integration_assistant/common/api/model/common_attributes.ts

@@ -123,7 +123,7 @@ export const InputType = z.enum([
   'filestream',
   'gcp-pubsub',
   'gcs',
-  'http-endpoint',
+  'http_endpoint',
   'journald',
   'kafka',
   'tcp',

x-pack/plugins/integration_assistant/public/components/create_integration/create_integration_assistant/steps/data_stream_step/data_stream_step.tsx

@@ -36,7 +36,7 @@ export const InputTypeOptions: Array<EuiComboBoxOptionOption<InputType>> = [
   { value: 'filestream', label: 'File Stream' },
   { value: 'gcp-pubsub', label: 'GCP Pub/Sub' },
   { value: 'gcs', label: 'Google Cloud Storage' },
-  { value: 'http-endpoint', label: 'HTTP Endpoint' },
+  { value: 'http_endpoint', label: 'HTTP Endpoint' },
   { value: 'journald', label: 'Journald' },
   { value: 'kafka', label: 'Kafka' },
   { value: 'tcp', label: 'TCP' },