Restore airflow_local_settings after the test_should_use_configured_log_name

[Taragolis]

This test add some side effect for all tests after it, as result some of them might fail with "random" error

pytest tests/providers/google/cloud/log/test_stackdriver_task_handler.py::test_should_use_configured_log_name tests/providers/google/common

...

FAILED tests/providers/google/common/hooks/test_discovery_api.py::TestGoogleDiscoveryApiHook::test_get_conn - google.auth.exceptions.DefaultCredentialsError: Your default credentials were not found. To set up Application Default Credentials, see https://cloud.google.com/docs/authentication/external/set-up-adc for more information.
======================================================= 1 failed, 83 passed, 2 skipped, 4 warnings in 10.72s =======================================================
Compute Engine Metadata server unavailable on attempt 1 of 3. Reason: [Errno 111] Connection refused
Compute Engine Metadata server unavailable on attempt 2 of 3. Reason: [Errno 111] Connection refused
Compute Engine Metadata server unavailable on attempt 3 of 3. Reason: [Errno 111] Connection refused
Authentication failed using Compute Engine authentication due to unavailable metadata server.
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/logging/__init__.py", line 2127, in shutdown
    h.close()
  File "/opt/airflow/airflow/providers/google/cloud/log/stackdriver_task_handler.py", line 385, in close
    self._transport.flush()
  File "/usr/local/lib/python3.8/functools.py", line 967, in __get__
    val = self.func(instance)
  File "/opt/airflow/airflow/providers/google/cloud/log/stackdriver_task_handler.py", line 156, in _transport
    return self.transport_type(self._client, self.gcp_log_name)  # type: ignore[call-arg]
  File "/opt/airflow/airflow/providers/google/cloud/log/stackdriver_task_handler.py", line 133, in _client
    credentials, project = self._credentials_and_project
  File "/usr/local/lib/python3.8/functools.py", line 967, in __get__
    val = self.func(instance)
  File "/opt/airflow/airflow/providers/google/cloud/log/stackdriver_task_handler.py", line 125, in _credentials_and_project
    credentials, project = get_credentials_and_project_id(
  File "/opt/airflow/airflow/providers/google/cloud/utils/credentials_provider.py", line 362, in get_credentials_and_project_id
    return _CredentialProvider(*args, **kwargs).get_credentials_and_project()
  File "/opt/airflow/airflow/providers/google/cloud/utils/credentials_provider.py", line 243, in get_credentials_and_project
    credentials, project_id = self._get_credentials_using_adc()
  File "/opt/airflow/airflow/providers/google/cloud/utils/credentials_provider.py", line 348, in _get_credentials_using_adc
    credentials, project_id = google.auth.default(scopes=self.scopes)
  File "/usr/local/lib/python3.8/site-packages/google/auth/_default.py", line 691, in default
    raise exceptions.DefaultCredentialsError(_CLOUD_SDK_MISSING_CREDENTIALS)
google.auth.exceptions.DefaultCredentialsError: Your default credentials were not found. To set up Application Default Credentials, see https://cloud.google.com/docs/authentication/external/set-up-adc for more information.

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[potiuk]

I arrived at almost the same solution :)