Removes EE differences for selects.scss

Closes gitlab-ee#10597

See merge request gitlab-org/gitlab-ce!26472

Resolve "Code in other column of side-by-side diff is highlighted when selecting code on one side"

Closes #48297

See merge request gitlab-org/gitlab-ce!26423

Removes EE differences for variables.scss

Closes gitlab-ee#10539

See merge request gitlab-org/gitlab-ce!26361

Update dependency @gitlab/ui to ^2.4.1

See merge request gitlab-org/gitlab-ce!26380

removes ee differences for avatar.scss

Closes gitlab-ee#10538

See merge request gitlab-org/gitlab-ce!26360

Removes EE differences for buttons.scss

Closes gitlab-ee#10535

See merge request gitlab-org/gitlab-ce!26358

Add error tracking usage counts

See merge request gitlab-org/gitlab-ce!25472

Correct JUnit report path pattern matching description

See merge request gitlab-org/gitlab-ce!26215

Fix Emoji URLs

Closes #59139

See merge request gitlab-org/gitlab-ce!26298

Docs: Fix missed or newly added broken anchors

See merge request gitlab-org/gitlab-ce!25997

Docs: Fixing anchors and links for all docs related to issues.

See merge request gitlab-org/gitlab-ce!25516

Add instance level templates to the examples page.

See merge request gitlab-org/gitlab-ce!25927

Fix link to personas UX guide

See merge request gitlab-org/gitlab-ce!26478

Move details of e2e tests to the bottom

See merge request gitlab-org/gitlab-ce!26494

Set proper default-branch on GitHub Import

Closes #59347

See merge request gitlab-org/gitlab-ce!26476

Refresh commit count after repository head changes

Closes #59346

See merge request gitlab-org/gitlab-ce!26473

Resolve ""Create project label" window is cut off at the bottom"

Closes #46787

See merge request gitlab-org/gitlab-ce!26049

The code should be written like a newspaper, wherein the top we
have more high level information, and as we go down we have more
details.

So I'm moving the implementation details to the bottom to make the
test easier to read.

Freeze strings in email service specs

See merge request gitlab-org/gitlab-ce!26485

Extract EE specific files/lines for Release app/serializers

See merge request gitlab-org/gitlab-ce!26087

Bump pg gem from 1.1.3 to 1.1.4

See merge request gitlab-org/gitlab-ce!26471

Revert "Merge branch 'winh-remove-sushi' into 'master'"

See merge request gitlab-org/gitlab-ce!26470

This keeps the version used by gitlab-monitor and GitLab CE
consistent. This release also adds Ruby 2.6 support and PostgreSQL 11
error codes:

https://github.com/ged/ruby-pg/blob/master/History.rdoc

[CE] Extract EE specific files/lines from spec/finders

Closes gitlab-ee#10142 and gitlab-ee#10141

See merge request gitlab-org/gitlab-ce!26337

This reverts merge request !26430

Add end-of-string to regex example

Closes #58031

See merge request gitlab-org/gitlab-ce!26302

Docs cleanup fe

See merge request gitlab-org/gitlab-ce!26158