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>

migrations/worker.go

@@ -150,8 +150,6 @@ func (worker *Worker) runMigration(key string, lastDone string) (bool, string, *
 	var err *model.AppError
 
 	switch key {
-	case model.MIGRATION_KEY_SIDEBAR_CATEGORIES_PHASE_2:
-		done, progress, err = worker.runSidebarCategoriesPhase2Migration(lastDone)
 	case model.MIGRATION_KEY_ADVANCED_PERMISSIONS_PHASE_2:
 		done, progress, err = worker.runAdvancedPermissionsPhase2Migration(lastDone)
 	default: