feat(queries): print JSON message for 4xx/422 responses before HTTPError

[ghinks]

Summary

When GitHub returns a 4xx response (such as 422 Validation Failed), the response includes a JSON body with a message field. This PR adds a helper function to extract and print the message field before raising the status exception in _make_pr_request_with_retry.

Changes

• Added _print_4xx_error_message to reviewtally/queries/get_prs.py to check for 4xx status codes, parse the JSON body, and print the message field.
• Integrated helper into _make_pr_request_with_retry right before calling raise_for_status.
• Added unit tests in tests/test_get_prs.py to assert correct printing for 422 responses and handle cases without messages or with invalid JSON.

Verification

• poetry run pytest -m "not integration" passed successfully.
• poetry run ruff check . and poetry run ruff format . passed successfully.