Introduce setTestTimeout() for synchronous Jest tests

Closes #58658

See merge request gitlab-org/gitlab-ce!25926

Docs: Add automatic redirects to many moved files

See merge request gitlab-org/gitlab-ce!25902

Docs: Add missing redirects to remaining EE-only docs

See merge request gitlab-org/gitlab-ee!9874

Docs: Fix markdown for link in chatops doc

See merge request gitlab-org/gitlab-ce!25952

Docs: (EE Port) Fix markdown for link in chatops doc

Closes #10302

See merge request gitlab-org/gitlab-ee!9947

Add infos about runners concurrent jobs in .gitlab-ci.yml documentation

See merge request gitlab-org/gitlab-ce!25809

Docs: Add missing redirects to /user docs (Only EE Docs)

See merge request gitlab-org/gitlab-ee!9873

This reverts commit 6408c787f2aca5131a1c854d880deea95bd24914

Docs: Fix CI/CD related anchors

See merge request gitlab-org/gitlab-ce!25591

Docs: (EE Port) Fix CI/CD related anchors

See merge request gitlab-org/gitlab-ee!9741

Docs: Clarify how Auto DevOps deploys using deploy token

See merge request gitlab-org/gitlab-ce!25787

We were emphasising a point that's no longer true since we implemented
deploy tokens in 11.0 so rationalize the docs here.

Update pipeline webhook example response

Closes #53121

See merge request gitlab-org/gitlab-ce!25914

Docs add noefs mention

See merge request gitlab-org/gitlab-ee!9696

Remove confusing author name from Changelog docs

See merge request gitlab-org/gitlab-ce!25928

Fix the last-ditch memory killer pgroup SIGKILL

See merge request gitlab-org/gitlab-ce!25940

Update cleanup.rake to fix a typo in the error message

See merge request gitlab-org/gitlab-ce!25901

Filter merge requests by target branch

See merge request gitlab-org/gitlab-ce!24380

EE port of filter merge requests by target branch

See merge request gitlab-org/gitlab-ee!9927

Conflicts:
  config/routes.rb

Align EmailValidator to validate_email gem implementation.

Closes #57352

See merge request gitlab-org/gitlab-ce!24971