MM-27007 Remove automatic sidebar migration (#15087)

* MM-27007 Add migration of favorited channels to CreateInitialSidebarCategories

* MM-27007 Rewrite migrateFavortitesToSidebarT to use ROW_NUMBER() when available

* MM-27007 Remove automatic sidebar migration

* Remove old i18n strings

* Fix typo

* Address feedback

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -5238,14 +5238,6 @@
     "id": "migrations.worker.run_migration.unknown_key",
     "translation": "Unable to run migration job due to unknown migration key."
   },
-  {
-    "id": "migrations.worker.run_sidebar_categories_phase_2_migration.internal_error",
-    "translation": "Migration failed due to database error."
-  },
-  {
-    "id": "migrations.worker.run_sidebar_categories_phase_2_migration.invalid_progress",
-    "translation": "Migration failed due to invalid progress data."
-  },
   {
     "id": "model.access.is_valid.access_token.app_error",
     "translation": "Invalid access token."