Merge #7442

7442: Fix `bundle exec`'ing to rubygems being silent r=deivid-rodriguez a=deivid-rodriguez

### What was the end-user problem that led to this PR?

The problem was that #7401 caused a regression where `bundle exec`'ing to rubygems would silence rubygems output.

### What was your diagnosis of the problem?

My diagnosis was that the removal of:
* Code where `Bundler::RGProxy` would be only set conditionally on `Bundler.ui =` not being passed `nil`.
* Code setting `Bundler.ui` to `nil` right before shelling during `bundle exec`.

caused rubygems UI to be silent during `bundle exec gem`.

### What is your fix for the problem, implemented in this PR?

My fix is to explictly "unsilence" rubygems UI before `bundle exec` calls.

### Why did you choose this fix out of the possible options?

I chose this fix because it's more explicit than the previous one.

Fixes #7441.


Co-authored-by: David Rodríguez <deivid.rodriguez@riseup.net>

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