[rubygems/rubygems] Stop removing the `.git` folder from cached git gems

If we want to change git gems to use a proper cache, instead of using
the cache folder as the install location, so we need to keep git
information in the cache, so that when running `bundle install` or
`bundler install --local`, we are able to figure out whether the
revision that needs to be checked out is present locally in the cache or
needs to be fetched from the remote repository.

https://github.com/rubygems/rubygems/commit/607eda63eb

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