refactor: Clean up RepoConfig + LocalRepoOperator

[caroljung-cg]

Motivation

Content

Testing

Please check the following before marking your PR as ready for review

• I have added tests for my changes
• I have updated the documentation or added new documentation as needed

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 17 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...degen/sdk/code_generation/current_code_codebase.py	14.28%	6 Missing ⚠️
...c/codegen/git/repo_operator/local_repo_operator.py	57.14%	3 Missing ⚠️
src/codegen/sdk/codebase/config.py	25.00%	3 Missing ⚠️
src/codegen/git/utils/codeowner_utils.py	0.00%	2 Missing ⚠️
.../codegen/git/repo_operator/remote_repo_operator.py	0.00%	1 Missing ⚠️
src/codegen/git/schemas/repo_config.py	92.30%	1 Missing ⚠️
tests/shared/skills/skill_implementation.py	0.00%	1 Missing ⚠️

Additional details and impacted files

[github-actions]

🎉 This PR is included in version 0.7.0 🎉

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