Show header and footer system messages in email

Closes #56863

See merge request gitlab-org/gitlab-ce!25474

Add docs for EE components in CE components

See merge request gitlab-org/gitlab-ce!25649

Upgrade jest and related dependencies

Closes #54834

See merge request gitlab-org/gitlab-ce!25597

CE port of noteable-discussion-ee-differences

See merge request gitlab-org/gitlab-ce!25638

Update best_practices.md let section to also reference let! variables.

See merge request gitlab-org/gitlab-ce!22496

Revert "Quarantine GitHub OAuth test"

Closes gitlab-org/quality/nightly#83

See merge request gitlab-org/gitlab-ce!25636

This removes other outdated babel@6 dependencies as well.

Unfortunately the newer version of vue-jest has a dependency of an older
version of ts-jest. In order to satisfy the peerDependency from ts-jest,
we are forcing the version@24. The only "breaking" change from ts-jest
23->24 is that it requires a newer version of jest. This might be
obsolete soon, as vue-jest plans on switching to babel eventually.

Use Web IDE path for merge request edit buttons

See merge request gitlab-org/gitlab-ce!25595

Fix bug where project topics truncate

Closes #57788

See merge request gitlab-org/gitlab-ce!25398

Enabling performance metrics on Review Apps

Closes #57881

See merge request gitlab-org/gitlab-ce!25549

This reverts commit 970576c5.

Update apollo libraries

See merge request gitlab-org/gitlab-ce!25608

Backport: Add project level config for merge pipelines

See merge request gitlab-org/gitlab-ce!25385

Jira: make issue links title compact

See merge request gitlab-org/gitlab-ce!25609

Port of a community contribution from @glensc to upstream.

Bring back mentions of Redash

See merge request gitlab-org/gitlab-ce!25618

Resolve "Add missing karma tests to the the MR Diff components"

Closes #55505

See merge request gitlab-org/gitlab-ce!24733

Quarantine GitHub OAuth tests

See merge request gitlab-org/gitlab-ce!25631

Allow Gitaly N+1 calls for RootController#index

See merge request gitlab-org/gitlab-ce!25514

Docs: Add EFS warning message for AWS installs

See merge request gitlab-org/gitlab-ce!25498

Add iOS-fastlane template for .gitlab-ci.yml

Closes #52877

See merge request gitlab-org/gitlab-ce!25395

Add schema

Add CE counter part

Add default value for

Add changelog

Fix schema

Add test

Fix schema

Fix schema version

Remove default value for

Add developer documentation for distributing tracing

See merge request gitlab-org/gitlab-ce!25150

This change adds developer documentation on using distributed tracing
using Jaeger.

Adhere to stylelint specs

See merge request gitlab-org/gitlab-ce!25620

This reverts commit 676e0a32.
It was removed when we thought we were moving to Looker.

More Stylelint rules

See merge request gitlab-org/gitlab-ce!25266

Feature: Runner tag filter for admin view

See merge request gitlab-org/gitlab-ce!19740

* Add email_header_and_footer_enabled flag to appearances table
* Set email_header_and_footer_enabled default value to false
* Add checkbox to appearance to toggle show header and footer in emails
* Add email_header_and_footer_enabled to allowed params in controller
* Add header and footer messages to the html and text email layouts
* Remove the color styling for emails header and footer
* Add empty_mailer layout for emails without layout,
to have the header and footer applied