refactor: improve workflow maintainability and consistency

[MatrixNeoKozak]

This PR refactors the GitHub Actions workflows to improve maintainability and consistency.

Summary of Changes

1. Extracted the monolithic Python script from update-add-rules.yml into a dedicated file scripts/fetch_rules.py.
2. Standardized Git operations across update-add-rules.yml and update-list-rules.yml by replacing manual git commands with stefanzweifel/git-auto-commit-action@v5.

Rationale

• Maintainability: Moving the Python logic out of the YAML file makes the code easier to read, test, and maintain.
• Consistency & Reliability: Using a centralized, well-maintained action for Git commits (stefanzweifel/git-auto-commit-action) reduces boilerplate code and improves the reliability of the Git operations compared to manual configurations within each workflow.

Technical Impact

• Workflows remain functionally equivalent but with improved modularity and structural integrity.
• Reduced risk of errors in manual Git configuration.

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