[rubygems/rubygems] Stop depending on `pathname` for subprocess launching

When launching bundler subprocesses for end to end testing, all of them
will load the `spec/support/rubygems_version_manager.rb` file passed as
a ruby's `-r` flag.

Unfortunately this file depends on `pathname`, so unless we drop that
dependency, we can't really test support for including the `pathname`
gem in the `Gemfile`.

This commit implements some refactorings to avoid loading `pathname`
inside `bundler` test subprocesses.

https://github.com/rubygems/rubygems/commit/c1f948788c

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