Use a standalone struct name for Organization (#17632)

* Use a standalone struct name for Organization

* recover unnecessary change

* make the code readable

* Fix template failure

* Fix template failure

* Move HasMemberWithUserID to org

* Fix test

* Remove unnecessary user type check

* Fix test

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/user/user.go

@@ -35,7 +35,7 @@ func DeleteUser(u *models.User) error {
 	//	cannot perform delete operation.
 
 	// Check ownership of repository.
-	count, err := models.GetRepositoryCount(ctx, u)
+	count, err := models.GetRepositoryCount(ctx, u.ID)
 	if err != nil {
 		return fmt.Errorf("GetRepositoryCount: %v", err)
 	} else if count > 0 {