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>

store/storetest/mocks/CommandWebhookStore.go

@@ -36,9 +36,7 @@ func (_m *CommandWebhookStore) Get(id string) (*model.CommandWebhook, error) {
 	if rf, ok := ret.Get(1).(func(string) error); ok {
 		r1 = rf(id)
 	} else {
-		if ret.Get(1) != nil {
-			r1 = ret.Get(1).(error)
-		}
+		r1 = ret.Error(1)
 	}
 
 	return r0, r1
@@ -61,9 +59,7 @@ func (_m *CommandWebhookStore) Save(webhook *model.CommandWebhook) (*model.Comma
 	if rf, ok := ret.Get(1).(func(*model.CommandWebhook) error); ok {
 		r1 = rf(webhook)
 	} else {
-		if ret.Get(1) != nil {
-			r1 = ret.Get(1).(error)
-		}
+		r1 = ret.Error(1)
 	}
 
 	return r0, r1
@@ -77,9 +73,7 @@ func (_m *CommandWebhookStore) TryUse(id string, limit int) error {
 	if rf, ok := ret.Get(0).(func(string, int) error); ok {
 		r0 = rf(id, limit)
 	} else {
-		if ret.Get(0) != nil {
-			r0 = ret.Get(0).(error)
-		}
+		r0 = ret.Error(0)
 	}
 
 	return r0