Move test workflows to pkg/cli/workflows and delete docs/RATE_LIMITING.md

- Moved test-rate-limit-defaults.md to pkg/cli/workflows/
- Moved test-rate-limit-ignored-roles.md to pkg/cli/workflows/
- Deleted docs/RATE_LIMITING.md (documentation exists elsewhere)
- Lock files for test workflows are not tracked per .gitignore

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot