Bring back Rugged implementation of commit_tree_entry

See merge request gitlab-org/gitlab-ce!25896

Extract quarantine code and add tests

Closes #57666

See merge request gitlab-org/gitlab-ce!25223

This avoids running before/after blocks for tests that are in quarantine

Updates how to export the state object

See merge request gitlab-org/gitlab-ce!25947

Backport EE CSS addition

See merge request gitlab-org/gitlab-ce!25874

Reduces EE differences for environments table

Closes gitlab-ee#10081

See merge request gitlab-org/gitlab-ce!25916

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: Fix markdown for link in chatops doc

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

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

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

Docs: Fix CI/CD related anchors

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

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

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

Align EmailValidator to validate_email gem implementation.

Closes #57352

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

This brings back some of the changes in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20176/diffs.

We discovered another N+1 that hits Gitaly `TreeEntry` via the
`RelativeLinkFilter`:
https://gitlab.com/gitlab-org/gitlab-ce/issues/58657. When a blob is
loaded with many relative links, `TreeEntry` is called for each link to
scan the URI type.

There are multiple paths that hit Gitaly `TreeEntry`, and
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25706 did not
cover all cases. This commit covers another common use case.

For users using Gitaly on top of NFS, accessing the Git data directly
via Rugged may be faster than going through than Gitaly. This merge
request introduces the feature flag `rugged_commit_tree_entry` to
activate the Rugged method.

Remove select2-rails (select2 is now installed via yarn)

See merge request gitlab-org/gitlab-ce!25929

Docs: intro to CI/CD - fix typos

See merge request gitlab-org/gitlab-ce!25917

Allows contributors to set the timeout
for individual jest tests.

Adding the dashboard skeleton SCSS file to CE.

[skip visual]

Skip gitlab:ui:visual job for docs again

See merge request gitlab-org/gitlab-ce!25922

Async loads EE components
Creates a Mixin for EE properties

Revert "Merge branch 'remove-select2-rails' into 'master'"

See merge request gitlab-org/gitlab-ce!25920

Fix gl-loading-icon bug before gitlab-ui update

See merge request gitlab-org/gitlab-ce!25683