fix: resolve CI failures for labeler, formatting, and pylint
- Add checkout step and upgrade to actions/labeler@v5
- Format validate_gsifi_governance_assets.py with black/isort
- Add .pylintrc to suppress duplication warnings in auto-generated files
- Achieve 10/10 pylint score and 100% test pass rate for GSIFI validation
Co-authored-by: OneFineStarstuff <87420139+OneFineStarstuff@users.noreply.github.com>