Merge pull request #389 from yjinjo/master

Extend old_user_ids and new_user_ids, not intialization

src/spaceone/identity/manager/workspace_group_manager.py

@@ -137,12 +137,12 @@ def get_unique_user_ids(
         old_user_ids = []
         if users := workspace_group_vo.users:
             unique_user_ids = {user["user_id"] for user in users}
-            old_user_ids = list(unique_user_ids)
+            old_user_ids.extend(list(unique_user_ids))
 
         new_user_ids = []
         for new_user_info in new_users_info_list:
             unique_user_ids = {new_user_info["user_id"]}
-            new_user_ids = list(unique_user_ids)
+            new_user_ids.extend(list(unique_user_ids))
 
         return old_user_ids, new_user_ids