[rubygems/rubygems] Clean up generated and copied files
leaving the files after gem rebuild was intentional, for local inspection, but the test suite should be made to clean up after itself independently of that. https://github.com/rubygems/rubygems/pull/4913#issuecomment-2081710691
https://github.com/rubygems/rubygems/commit/185a2091fb
[rubygems/rubygems] Clean up generated and copied files
https://github.com/rubygems/rubygems/commit/185a2091fb