[ruby/rubygems] Allow bundle pristine to work for git gems in the same repo:

- Fix https://github.com/ruby/rubygems/pull/9186
- ### Problem

  Running `bundle pristine` in a Gemfile where there is many git gem
  pointing to the same repository will result in a error
  "Another git process seems to be running in this repository".

  ### Context

  This error is a regression since https://github.com/ruby/rubygems/commit/a555fd6ccd17
  where `bundle pristine` now runs in parallel which could lead
  to running simultaneous git operations in the same repository.

  ### Solution

  When Bundler pristine a git gem it does a `git reset --hard` without
  specifying a path.
  This means the whole repository will be reset. In this case, we can
  leverage that by just pristining one gem per unique git sources.
  This is also more efficient.

https://github.com/ruby/rubygems/commit/710ba514a8

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