fix: mock list_validations in config_runner tests to remove GCS dependency

[yasumorishima]

Summary

• Mock cli_tools.list_validations in test_config_runner_2 and test_config_runner_4 to remove dependency on real GCS buckets (gs://pso-kokoro-resources)
• Replace GCS paths in test config dicts with local paths

Issue

Fixes #1482

Root Cause

config_runner() calls cli_tools.list_validations(config_dir=args.config_dir) which reaches gcs_helper.list_gcs_directory() when the path starts with gs://. External contributors without GCS credentials get DefaultCredentialsError.

Changes

• test_config_runner_2: Added @mock.patch("data_validation.cli_tools.list_validations") returning 3 YAML filenames
• test_config_runner_4: Added @mock.patch("data_validation.cli_tools.list_validations") returning 4 YAML filenames
• CONFIG_RUNNER_ARGS_2 / CONFIG_RUNNER_ARGS_4: Changed config_dir from gs://pso-kokoro-resources/... to /tmp/test/...

Testing

$ python -m pytest tests/unit/test__main.py -v
============================= 20 passed in 10.96s ==============================

$ python -m black --check tests/unit/test__main.py
All done! 1 file would be left unchanged.

$ python -m flake8 tests/unit/test__main.py
(no output)

Full unit test suite: 375 passed, 2 failed (pre-existing GCP auth failures unrelated to this change), 10 skipped.

[nj1973]

Thanks for the contribution @yasumorishima , this LGTM.

[nj1973]

/gcbrun