Resolve "Track navbar clicks on GitLab.com"

Closes #7427

See merge request gitlab-org/gitlab-ee!7787

(CE-Port) Support navbar tracking

See merge request gitlab-org/gitlab-ce!23975

Rails5: convert specs in javascripts/ and support/ to new spec syntax

See merge request gitlab-org/gitlab-ce!23947

- Add tracking attributes to templates

Update minimum version of nokogiri in Gemfile also

See merge request gitlab-org/gitlab-ce!23829

[master] Persistent Symlink in Project Import

See merge request gitlab/gitlabhq!2673

Add changelog for weight sort fix

See merge request gitlab-org/gitlab-ee!8938

Fix notification email for image diff notes

See merge request gitlab-org/gitlab-ce!23958

Always load the metrics the last

Closes #55611

See merge request gitlab-org/gitlab-ce!23960

Add tracing to usage stats

Closes #8318

See merge request gitlab-org/gitlab-ee!8940

Display commit ID for discussions made on merge request commits

Closes #53953

See merge request gitlab-org/gitlab-ce!23837

Fixes: ActionView::Template::Error (undefined method `add_class' for #<Nokogiri::XML::Element:0x0055dbff5252e8>

Fix typos about .gitlab-ci.yml in Serverless docs

See merge request gitlab-org/gitlab-ce!23963

Fixes a bug where merge request comments made
in the context of a specific commit no longer specify
which commit they were created on

Display "commented" only for commit discussions on merge requests

Closes #53950 and #53681

See merge request gitlab-org/gitlab-ce!23622

Display "commented" only for commit discussions on merge requests (EE-port)

Closes gitlab-ce#53950 and gitlab-ce#53681

See merge request gitlab-org/gitlab-ee!8790

Use px instead of rems to prep for csslab

Closes #55314

See merge request gitlab-org/gitlab-ce!23804

Fix line-height of line numbers

Closes #55278 and #51668

See merge request gitlab-org/gitlab-ce!23775

Fix broken link in feature proposal template

See merge request gitlab-org/gitlab-ce!23957

[ci skip]

Resolve "build-loader-animation dots misaligned"

Closes #52620

See merge request gitlab-org/gitlab-ce!23959

Add support for attaching epics to an epic

Closes #8333

See merge request gitlab-org/gitlab-ee!8637

Remove deprecated xhr from specs

Closes #55448

See merge request gitlab-org/gitlab-ce!23949

[ci skip]