Remove redundant dependencies

[rjavadi]

Summary

There're some pip audit errors that are either for unused dependencies or can be safely ignored. I removed transformers and added ignored vulnerabilities to code_checks.yml

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Test improvements
• 🔒 Security fix

Changes Made

• Removed transformers unused dependency
• Added vulnerabilities to ignore-vulns in code_checks.yml

Testing

• uv lock && uv sync --all-extras --dev
• pip-audit passes (with ignore list)
• pre-commit run --all-files
• pytest -m "not integration_test" in aieng-eval-agents
• smoke imports pass
• GitHub Actions green on the PR

Manual testing details:

Screenshots/Recordings

Related Issues

Relates to #108

Checklist

• Code follows the project's style guidelines
• Self-review of code completed
• Documentation updated (if applicable)
• No sensitive information (API keys, credentials) exposed