MM-64330 - filter abac users in channel invite (#31219)

* MM-64330 - filter abac users in channel invite

* implement cursor functionality for abac user filtering

* remove unnecessary comments

* refactor the backend implementation simplifying the functions

* refactor api to use opts as parameters, rename function

* add missing translation

* remove unnecesary test code

---------

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

server/i18n/en.json

@@ -4118,6 +4118,10 @@
     "id": "api.user.get_users.validation.app_error",
     "translation": "Error fetching roles during validation."
   },
+  {
+    "id": "api.user.get_users_not_in_abac_channel.access_control_unavailable.app_error",
+    "translation": "Access control service unavailable. Cannot filter users for ABAC-enabled channel."
+  },
   {
     "id": "api.user.invalidate_password_recovery_tokens.error",
     "translation": "Unable to get tokens by type when invalidating password recovery tokens"