Nested folders: Write to folders table even if the feature toggle is off (#77788)

* Update folders table even if the feature toggle is off

* Fix failing test

* Apply review feedback

* Revert test changes

pkg/services/folder/folderimpl/sqlstore.go

@@ -140,7 +140,7 @@ func (ss *sqlStore) Update(ctx context.Context, cmd folder.UpdateFolderCommand)
 			return folder.ErrInternal.Errorf("failed to get affected row: %w", err)
 		}
 		if affected == 0 {
-			return folder.ErrInternal.Errorf("no folders are updated")
+			return folder.ErrInternal.Errorf("no folders are updated: %w", folder.ErrFolderNotFound)
 		}
 
 		foldr, err = ss.Get(ctx, folder.GetFolderQuery{