Move language setting to preferences

Closes #35638

See merge request gitlab-org/gitlab-ce!25427

Template and process improvements for documentation

See merge request gitlab-org/gitlab-ce!24315

Move ChatOps to Core

See merge request gitlab-org/gitlab-ce!24780

ChatOps used to be in the Ultimate tier.

fix #39010 - add left margin to 1st time contributor badge

Closes #39010

See merge request gitlab-org/gitlab-ce!25216

Document how to enable feature flags for Review Apps

See merge request gitlab-org/gitlab-ce!25399

Signed-off-by: Rémy Coutable <remy@rymai.me>

Ignore revert commits

Closes #57912

See merge request gitlab-org/gitlab-ce!25396

Quarantine failing test

See merge request gitlab-org/gitlab-ce!25424

Docs: change badges.svg example to pipeline.svg

See merge request gitlab-org/gitlab-ce!25157

Added id to namespace name generator

See merge request gitlab-org/gitlab-ce!25285

Removed quarantine tag from the squash merges test;

Bump helm and kubectl for Kubernetes integration

See merge request gitlab-org/gitlab-ce!25268

This introduces additional method for linting,
to reduce the complexity of `lint_commits`.

Remove undigested token column from personal_access_tokens table

See merge request gitlab-org/gitlab-ce!22743

Token column are no longer used as token values are stored digested in
token_digest.

Update docs to indicate unicorn metrics are automatically scraped

See merge request gitlab-org/gitlab-ce!25406

Added missing comma in sample response json for list of boards and a single board

See merge request gitlab-org/gitlab-ce!25419

Update QA docs: clarify spec vs. specs/features and use end-to-end instead of integration

See merge request gitlab-org/gitlab-ce!25413

Fix WebHookService spec failing in Ruby 2.6

See merge request gitlab-org/gitlab-ce!25317

Bump Helm and kubectl in Auto DevOps

See merge request gitlab-org/gitlab-ce!25072

Comment why we can't use Gitlab::CurrentSettings

See merge request gitlab-org/gitlab-ce!25412

Upgrade Webmock to 3.5.1

See merge request gitlab-org/gitlab-ce!25318

Refactor CI/CD landing page

Closes #50498 and #56973

See merge request gitlab-org/gitlab-ce!24894

Restructures existing page and adds improvements.

Add a type property to project autocomplete members

Closes #57771

See merge request gitlab-org/gitlab-ce!25296

Docs: Fix all anchors related to auto-devops

See merge request gitlab-org/gitlab-ce!25061

Refactor/simplify Auto DevOps QA spec

Closes #57921

See merge request gitlab-org/gitlab-ce!25401

See https://gitlab.com/gitlab-org/gitlab-ee/issues/9833

Use consistent language (end-to-end instead of integration).

Clarify purpose of `qa/specs/features/` vs. `spec`

Bump kubectl in Auto DevOps to 1.11.7. Minor patch upgrade from 1.11.6.