Adds Shared Channel related API endpoints (#27436)

* Adds Shared Channel management API endpoints

New endpoints for the following routes are added:

- Get Shared Channel Remotes by Remote Cluster at `GET
/api/v4/remotecluster/{remote_id}/sharedchannelremotes`
- Invite Remote Cluster to Channel at `POST
/api/v4/remotecluster/{remote_id}/channels/invite`
- Uninvite Remote Cluster to Channel at `POST
/api/v4/remotecluster/{remote_id}/channels/uninvite`

These endpoints are planned to be used from the system console, and
gated through the `manage_secure_connections` permission.

* Adds i18n messages for API errors

* Fix pagination flaky test

* Fix linter

* Adds the posibility of filtering shared channel remotes by home

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

api/v4/source/definitions.yaml

@@ -3535,6 +3535,44 @@ components:
           description: The time in milliseconds a remote cluster was last pinged successfully
           type: integer
           format: int64
+    SharedChannelRemote:
+      type: object
+      properties:
+        id:
+          description: The id of the shared channel remote
+          type: string
+        channel_id:
+          description: The id of the channel
+          type: string
+        creator_id:
+          description: Id of the user that invited the remote to share the channel
+          type: string
+        create_at:
+          description: Time in milliseconds that the remote was invited to the channel
+          type: integer
+        update_at:
+          description: Time in milliseconds that the shared channel remote record was last updated
+          type: integer
+        is_invite_accepted:
+          description: Indicates if the invite has been accepted by the remote
+          type: boolean
+        is_invite_confirmed:
+          description: Indicates if the invite has been confirmed by the remote
+          type: boolean
+        remote_id:
+          description: Id of the remote cluster that the channel is shared with
+          type: string
+        last_post_update_at:
+          description: Time in milliseconds of the last post in the channel that was synchronized with the remote update_at
+          type: integer
+        last_post_id:
+          description: Id of the last post in the channel that was synchronized with the remote
+          type: string
+        last_post_create_at:
+          description: Time in milliseconds of the last post in the channel that was synchronized with the remote create_at
+          type: string
+        last_post_create_id:
+          type: string
     SystemStatusResponse:
       type: object
       properties: