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>

server/i18n/en.json

@@ -2874,6 +2874,22 @@
     "id": "api.server.start_server.starting.critical",
     "translation": "Error starting server, err:%v"
   },
+  {
+    "id": "api.shared_channel.get_shared_channel_remotes_error",
+    "translation": "Could not fetch shared channel remotes"
+  },
+  {
+    "id": "api.shared_channel.has_remote_error",
+    "translation": "Could not determine if channel is shared with the remote"
+  },
+  {
+    "id": "api.shared_channel.invite_remote_to_channel_error",
+    "translation": "Could not invite remote to channel"
+  },
+  {
+    "id": "api.shared_channel.uninvite_remote_to_channel_error",
+    "translation": "Could not uninvite remote to channel"
+  },
   {
     "id": "api.slackimport.slack_add_bot_user.email_pwd",
     "translation": "The Integration/Slack Bot user with email {{.Email}} and password {{.Password}} has been imported.\r\n"