Test: Update test cases for PR 6906 (#6929)

### What problem does this PR solve?

PR #6906

### Type of change

- [x] Update test cases

sdk/python/test/test_http_api/test_chat_assistant_management/test_delete_chat_assistants.py

@@ -44,8 +44,8 @@ class TestChatAssistantsDelete:
         [
             (None, 0, "", 0),
             ({"ids": []}, 0, "", 0),
-            ({"ids": ["invalid_id"]}, 102, "You don't own the chat invalid_id", 5),
-            ({"ids": ["\n!?。；！？\"'"]}, 102, "You don't own the chat \n!?。；！？\"'", 5),
+            ({"ids": ["invalid_id"]}, 102, "Assistant(invalid_id) not found.", 5),
+            ({"ids": ["\n!?。；！？\"'"]}, 102, """Assistant(\n!?。；！？"\') not found.""", 5),
             ("not json", 100, "AttributeError(\"'str' object has no attribute 'get'\")", 5),
             (lambda r: {"ids": r[:1]}, 0, "", 4),
             (lambda r: {"ids": r}, 0, "", 0),
@@ -57,8 +57,8 @@ class TestChatAssistantsDelete:
             payload = payload(chat_assistant_ids)
         res = delete_chat_assistants(get_http_api_auth, payload)
         assert res["code"] == expected_code
-        #if res["code"] != 0:
-        #    assert res["message"] == expected_message
+        if res["code"] != 0:
+            assert res["message"] == expected_message
 
         res = list_chat_assistants(get_http_api_auth)
         assert len(res["data"]) == remaining
@@ -90,13 +90,13 @@ class TestChatAssistantsDelete:
 
         res = delete_chat_assistants(get_http_api_auth, {"ids": chat_assistant_ids})
         assert res["code"] == 102
-        #assert "You don't own the chat" in res["message"]
+        assert "not found" in res["message"]
 
     def test_duplicate_deletion(self, get_http_api_auth, add_chat_assistants_func):
         _, _, chat_assistant_ids = add_chat_assistants_func
         res = delete_chat_assistants(get_http_api_auth, {"ids": chat_assistant_ids + chat_assistant_ids})
         assert res["code"] == 0
-        assert "Duplicate chat ids" in res["data"]["errors"][0]
+        assert "Duplicate assistant ids" in res["data"]["errors"][0]
         assert res["data"]["success_count"] == 5
 
         res = list_chat_assistants(get_http_api_auth)