Migrate "Team.RemoveAllMembersByUser" to Sync by default (#11560)

* Migrate "Team.RemoveAllMembersByUser" to Sync by default

* fixing merge problem

app/user.go

@@ -1479,8 +1479,8 @@ func (a *App) PermanentDeleteUser(user *model.User) *model.AppError {
 		return err
 	}
 
-	if result := <-a.Srv.Store.Team().RemoveAllMembersByUser(user.Id); result.Err != nil {
-		return result.Err
+	if err := a.Srv.Store.Team().RemoveAllMembersByUser(user.Id); err != nil {
+		return err
 	}
 
 	mlog.Warn(fmt.Sprintf("Permanently deleted account %v id=%v", user.Email, user.Id), mlog.String("user_id", user.Id))