Test: Update test cases for PR 6888 ISSUE 6876 (#6907)

### What problem does this PR solve?

PR #6888 ISSUE #6876

### Type of change

- [x] Update test case

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

         assert res["message"] == "You don't own the chat invalid_id"
 
         res = list_chat_assistants(get_http_api_auth)
-        print(res)
         assert len(res["data"]) == 0
 
     def test_repeated_deletion(self, get_http_api_auth, add_chat_assistants_func):
         assert res["code"] == 102
         assert "You don't own the chat" in res["message"]
 
-    @pytest.mark.skip(reason="issues/6876")
     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})
-        print(res)
         assert res["code"] == 0
         assert "Duplicate chat ids" in res["data"]["errors"][0]
-        assert res["data"]["success_count"] == 3
+        assert res["data"]["success_count"] == 5
 
-        res = delete_chat_assistants(get_http_api_auth)
-        assert len(res["data"]) == 0
+        res = list_chat_assistants(get_http_api_auth)
+        assert res["code"] == 0
 
     @pytest.mark.slow
     def test_concurrent_deletion(self, get_http_api_auth):

sdk/python/test/test_http_api/test_session_management/test_create_session_with_chat_assistant.py

         res = delete_chat_assistants(get_http_api_auth, {"ids": [chat_assistant_ids[0]]})
         assert res["code"] == 0
         res = create_session_with_chat_assistant(get_http_api_auth, chat_assistant_ids[0], {"name": "valid_name"})
-        print(res)
         assert res["code"] == 102
         assert res["message"] == "You do not own the assistant."