Beautify cert based cluster scanning and output, using GitLab Duo /refactor

Code Summary

This update significantly improves the GitLab Kubernetes cluster scanner script that helps identify certificate-based clusters that need migration. The changes transform a basic utility into a more professional, user-friendly tool with:

1. Better documentation through a proper docstring explaining the purpose and requirements
2. Enhanced output formatting that makes cluster information more readable with clear section dividers
3. A new function to format cluster details in a structured way, showing only the most relevant information
4. More comprehensive cluster information display including creation dates, status, provider details, and creator information
5. Summary statistics showing total counts of clusters found
6. Improved organization with clear separation between group and project clusters
7. Timestamp information in the output to track when scans were performed
8. Better error handling and code structure

The script now presents information in a much more digestible format, making it easier for administrators to plan their Kubernetes cluster migrations.