[8.x] [ML] Update JSON schemas for code editors (#207706) (#207723)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[ML] Update JSON schemas for code editors
(#207706)](#207706)

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

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

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Update JSON schemas for code editors (#207706)\n\n## Summary\r\n\r\n-
Updates the default path to the openapi file \r\n- Updates JSON schemas
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Update JSON schemas for code editors
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Update JSON schemas for code editors (#207706)\n\n## Summary\r\n\r\n-
Updates the default path to the openapi file \r\n- Updates JSON schemas
for ML and Transform code editors with the latest\r\nchanges from
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Update JSON schemas for code editors (#207706)\n\n## Summary\r\n\r\n-
Updates the default path to the openapi file \r\n- Updates JSON schemas
for ML and Transform code editors with the latest\r\nchanges from
elasticsearch-specification","sha":"ab2379f1f7c4563a5f3c119033bcff5397bab0f6"}},{"branch":"8.x","label":"v8.18.0","branchLabelMappingKey":"^v8.18.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Dima Arnautov <[email protected]>

x-pack/platform/packages/private/ml/json_schemas/README.md

@@ -1,3 +1,27 @@
 # @kbn/json-schemas
 
-JSON schema for code editors in Kibana
+This package provides JSON schemas used by code editors within the Kibana app.
+
+## Generating/Updating the JSON Schema
+
+To generate or update the output JSON schema files, run the following command from the root directory of the package:
+
+```bash
+yarn run jsonSchema
+```
+
+By default, this command assumes that your `elasticsearch-specification` folder is located next to the Kibana repository. If your `elasticsearch-specification` folder is located elsewhere, you can specify the path to the OpenAPI file as a command-line argument:
+
+```bash
+yarn run jsonSchema /path/to/elasticsearch-specification/output/openapi/elasticsearch-serverless-openapi.json
+```
+
+### Example:
+
+```bash
+yarn run jsonSchema /Users/my_user/dev/elasticsearch-specification/output/openapi/elasticsearch-serverless-openapi.json
+```
+
+This will generate or update the necessary JSON schema files in the `./src` folder.
+
+Once the changes are made, ensure they are reviewed and merged to the appropriate release version. 

x-pack/platform/packages/private/ml/json_schemas/src/json_schema_service.ts

@@ -46,6 +46,8 @@ export class JsonSchemaService {
       '..',
       '..',
       '..',
+      '..',
+      '..',
       'elasticsearch-specification',
       'output',
       'openapi',