Add changelog and doc strings

changelogs/unreleased/enable-disable-error-tracking-api.yml

+---
+title: Add API to enable and disable error tracking settings
+merge_request: 24220
+author: Rajendra Kadam
+type: added

doc/api/error_tracking.md

@@ -30,3 +30,31 @@ Example response:
   "api_url": "https://sentry.io/api/0/projects/myawesomeproject/project"
 }
 ```
+
+### Enable/Disable Error Tracking project settings
+
+The API allows you to enable or disable the Error Tracking settings for a project. Only for project maintainers.
+
+```
+PATCH /projects/:id/error_tracking/settings
+```
+
+| Attribute | Type    | Required | Description           |
+| --------- | ------- | -------- | --------------------- |
+| `id`      | integer | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
+| `active`  | boolean | yes      | Pass `true` to enable the already configured error tracking settings or `false` to disable it. |
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/projects/1/error_tracking/settings?active=true
+```
+
+Example response:
+
+```json
+{
+  "active": true,
+  "project_name": "sample sentry project",
+  "sentry_external_url": "https://sentry.io/myawesomeproject/project",
+  "api_url": "https://sentry.io/api/0/projects/myawesomeproject/project"
+}
+```