MM-56513 Prevent deactivated users to be added as channel members (#25954)

* Prevent deactivated users to be added as channel members

* remove "deactivated" from error message

server/i18n/en.json

@@ -4854,6 +4854,10 @@
     "id": "app.bot.permenent_delete.bad_id",
     "translation": "Unable to delete the bot."
   },
+  {
+    "id": "app.channel.add_member.deleted_user.app_error",
+    "translation": "Unable to add thr user as a member of the channel."
+  },
   {
     "id": "app.channel.analytics_type_count.app_error",
     "translation": "Unable to get channel type counts."