Move all logic for destroying a Pipeline into a service so it's easily
reusable.

Docs: updates docs development guidelines

Closes #53160 and #53115

See merge request gitlab-org/gitlab-ce!22813

Dangerbot: mention tech writers based on DevOps stage

See merge request gitlab-org/gitlab-ce!22945

Bump Sidekiq and other related gems

See merge request gitlab-org/gitlab-ce!22956

Fix  ./spec/features/issues/user_views_issue_spec.rb

Closes gitlab-ee#8390

See merge request gitlab-org/gitlab-ce!22976

Add Discord integration

Closes #21635

See merge request gitlab-org/gitlab-ce!22684

Disable usage pings in review apps

See merge request gitlab-org/gitlab-ce!22965

Merge branch '53082-gitlab-ce-11-4-0-gemfile-conflict-gitlab-markup-and-github-markup' into 'master'

Update gitlab-markup gem to avoid binary name collision

Closes #53082

See merge request gitlab-org/gitlab-ce!22960

Fix some links and Markdown

See merge request gitlab-org/gitlab-ce!22972

CI randomly fails with:
    ActiveRecord::RecordNotFound:
       Couldn't find Project with 'id'=724

This is probably caused by DB cleanup strategy used for :js
tests in combination with `set`.

Update URLs to better ones

See merge request gitlab-org/gitlab-ce!22931

Fix link for raising helm chart issues

See merge request gitlab-org/gitlab-ce!22970

Add link in K8s integration docs to RBAC roles

See merge request gitlab-org/gitlab-ce!22941

Docs: Update Variable naming

See merge request gitlab-org/gitlab-ce!22352

See https://gitlab.com/gitlab-org/gitlab-ce/issues/53082

Fix error handling bugs in kubernetes integration

See merge request gitlab-org/gitlab-ce!22922

* Sidekiq changes:
  https://github.com/mperham/sidekiq/blob/master/Changes.md

* Rack 1.6.1 fixes CVE-2014-9490:
  https://github.com/rack/rack/blob/master/CHANGELOG.md

* rack-protection 2.0.4 only fixes a minor message:
  https://github.com/sinatra/sinatra/commits/master/rack-protection

Use gitlab-ui in jobs and pipelines

See merge request gitlab-org/gitlab-ce!22782

Remove circular dependency on Redactable in migration

See merge request gitlab-org/gitlab-ce!22951

Resolve "GitLab Pages settings regressions"

Closes #48475

See merge request gitlab-org/gitlab-ce!22821

Updates clipboard button with gitlab-ui

See merge request gitlab-org/gitlab-ce!22923

Gitlab::BackgroundMigration::RedactLinks was prepending
EE::Gitlab::BackgroundMigration::RedactLinks, while
EE::Gitlab::BackgroundMigration::RedactLinks was trying to include
Gitlab::BackgroundMigration::RedactLinks::Redactable. Ruby 2.5.3 failed
with an uninitialized constant
(https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/118388511).