Update gitlab-styles to close #54853

Closes #54853

See merge request gitlab-org/gitlab-ce!31155

1. The output isn't great. It can be hard to find hotspots and, even
   when you do find them, to find why those are hotspots.
2. It uses some jQuery-specific frontend code which we can remove now
   that we don't have this any more.
3. It's only possible to profile the initial request, not any subsequent
   AJAX requests.

Have deterministic DNS for specs

See merge request gitlab-org/gitlab-ce!31086

This adds support for a number of new languages (e.g. Ada)
and fixes a number of lexers:
https://github.com/rouge-ruby/rouge/compare/v3.5.1..v3.7.0

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64625

This means we have one less Net::HTTP monkeypatch.

sham_rack cannot handle IPv6 addresses which means it breaks Net::HTTP
connections because it monkey-patches Net::HTTP

Update Rugged to 0.28.2

See merge request gitlab-org/gitlab-ce!31218

This is a bug fix release:
https://github.com/libgit2/libgit2/releases

This uses an ActiveRecord subscriber to get queries and calculate the
total query time from that. This means that the total will always be
consistent with the queries in the table. It does however mean that we
could potentially miss some queries that don't go through ActiveRecord.

Making this change also allows us to unify the response JSON a little
bit, making the frontend slightly simpler as a result.

None of this code can be reached any more, so it can all be removed