Users/v soujanya/testfailurefixes (#1489)

* fixing the test failure

* Change validate_token_for_instance mock return value from True to None

* remove the MagicMock

Author: v-soujanya

.github/workflows/merge-workflow.yml

@@ -87,8 +87,6 @@ jobs:
         python-version:
           - '3.12'
           - '3.11'
-          - '3.10'
-          - '3.9'
     steps:
       - uses: actions/checkout@v2
       - uses: ./.github/actions/run-tests

azure-devops/azext_devops/tests/utils/authentication.py

@@ -26,5 +26,6 @@ def authentication_setup(self):
 
     def authenticate(self):
         # set return values
-        self.mock_validate_token.return_value = True
+        # Return None instead of True to prevent token validation side effects
+        self.mock_validate_token.return_value = None
         self.mock_get_credential.return_value = UNIT_TEST_PAT_TOKEN