fix: address CI/CD issues

src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_pollers.py

@@ -1,3 +1,8 @@
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+
 import unittest
 from unittest.mock import Mock