Delete .crush and .local cache folders before starting crush

[bradflaugher]

Add remove_cache_folders() function that clears the .crush and .local directories at startup to ensure each run starts with a fresh state.

Summary

• Replace this line with a summary of your changes

Testing

• pytest
• other (please describe)

Checklist

• Documentation updated (if needed)
• Tests added or updated (if needed)
• Ready for review