Remove issuable drag and drop and sorting from milestone view

Closes #20900

See merge request !11950

Add missing bottom border to blame age legend

Closes #33739

See merge request !12205

Missing translations for the project & repository pages.

Closes #33420

See merge request !12052

Document the Delete Merged Branches functionality

See merge request !12217

Create responsive mobile view for pipelines table

Closes #31415

See merge request !12171

Add French translations for Cycle Analytics, Project, and Repository pages.

Closes #32998 and #33140

See merge request !12200

Speed up used languages calculation on charts page

See merge request !12212

set ENV['prometheus_multiproc_dir'] in config/boot.rb instead of config.ru

See merge request !12201

We removed calls from our code to Rugged::Repository#fetch_attributes:
<https://gitlab.com/gitlab-org/gitlab_git/commit/340e111e040ae847b614d35b4d3173ec48329015>

However, we didn't remove calls from within Linguist. This method is only called
when calculating the languages for a repository on the Charts page:
<https://github.com/github/linguist/blob/v4.7.0/lib/linguist/lazy_blob.rb#L33-L36>

We can safely use our own Gitlab::Git::Attributes here. On staging, for the
GitLab CE repo, this makes the calculation take about a third of the time:

    # Before
    Benchmark.realtime do
      Linguist::Repository.new(repository.rugged,
                               repository.rugged.head.target_id).languages
    end
    #=> 23.67193900188431

    # After
    Benchmark.realtime do
      Linguist::Repository.new(repository.rugged,
                               repository.rugged.head.target_id).languages
    end
    #=> 8.945212290156633

Wait for all Ajax and Vue requests to complete in JavaScript tests

Closes #33756

See merge request !12203

Convdev docs

See merge request !12189

Clarify job selection algorithm docs

See merge request !12199

Use the same way to invalidate cache from EE

See merge request !12187

Expose correct path to group

See merge request !12176

Fix intermittent spec failures in spec/finders/pipelines_finder_spec.rb

See merge request !12207

[ci skip]

Replace PhantomJS with Chrome in Karma test runner (2nd attempt)

Closes #33633

See merge request !12144

Issue board docs

See merge request !12197

Jira integ docs

See merge request !12196

Confidential issues redesign docs

See merge request !12195

The spec was trying to sort pipelines by user ID, but the same user ID
was being used for each pipeline in the spec. This is similar to #33001.

From logs in #33756, we that it's possible for an Ajax call to be made
before the middleware receives it. To prevent stray Ajax calls from
breaking other specs, we need to wait for all scheduled calls to finish.

Closes #33756

Update ruby metrics endpoint text to be clearer

See merge request !12157