Update the MR template for security MRs

Closes gitlab-org/release/framework#256

See merge request gitlab-org/gitlab-ce!26658

This makes two changes to the template:

1. EE MRs are now always required (see
   https://gitlab.com/gitlab-org/release/framework/issues/256 for a
   backstory).

2. We clarify that a release manager is not a suitable reviewer for
   security merge requests.

Optimize /api/v4/projects endpoint for visibility level

See merge request gitlab-org/gitlab-ce!26481

Unquarantine previously failing auto devops test

See merge request gitlab-org/gitlab-ce!26641

The smoke test for AutoDevOps was previously failing.
This test is now passing and ready to be unquarantined

Removes extra space in CE

Closes gitlab-ee#10710

See merge request gitlab-org/gitlab-ce!26649

Removes EE differences for issuable.scss

See merge request gitlab-org/gitlab-ce!26588

If the requested visibility levels contains only public and/or internal,
omitting private, then we can skip the EXISTS query to search for
private projects for the user.

Previously when a user requested a list of projects,
`Project#public_or_visible_to_user` would search all authorized projects
and public/internal projects as well. However, when a user requests a
specific `visibility_level` (e.g. private), that should reduce the
search space, and we shouldn't need to load public/internal projects.

Improves https://gitlab.com/gitlab-org/gitlab-ce/issues/59329

Fixes link in artifacts breadcrumb

Closes #59502

See merge request gitlab-org/gitlab-ce!26592

The link to the job page was not set properly,
with this commit it links to the correct job page.

Copy missing test in assignees_spec.js from EE

Closes gitlab-ee#6641

See merge request gitlab-org/gitlab-ce!26618

Remove expand diff to full file feature flag

See merge request gitlab-org/gitlab-ce!26614

Resolve "Get milestone by title via API"

Closes #59296

See merge request gitlab-org/gitlab-ce!26573

Removes EE differences for framework.scss

Closes gitlab-ee#10677

See merge request gitlab-org/gitlab-ce!26590

Provide custom Jest environment with mocked console

Closes #58203

See merge request gitlab-org/gitlab-ce!26577

CE: Insights Frontend

See merge request gitlab-org/gitlab-ce!26284

Update aws install doc non ha

See merge request gitlab-org/gitlab-ce!26387

Allow multiple repositories per project

See merge request gitlab-org/gitlab-ce!26539

Docs: Fix anchor from user/group to user/project

See merge request gitlab-org/gitlab-ce!26637

Backport of avoid_n_plus_1_es_load_blobs

See merge request gitlab-org/gitlab-ce!26522

Update go guidelines, fix some minor typos

See merge request gitlab-org/gitlab-ce!26562

Docs: Fix more anchors, mostly pipeline related

See merge request gitlab-org/gitlab-ce!26560

Make the job#successful? method wait by refreshing

See merge request gitlab-org/gitlab-ce!26344

Allow custom hooks errors to appear in GitLab UI

Closes #48132

See merge request gitlab-org/gitlab-ce!25625

Merge branch '49910-reopening-a-closed-milestone-from-the-closed-milestones-page-fails2' into 'master'

Fix bug when reopening milestone from index page

Closes #49910

See merge request gitlab-org/gitlab-ce!26597

Revert "Merge branch 'remove-unused-css-from-mr-24724' into 'master'"

See merge request gitlab-org/gitlab-ce!26609

Add development documentation for gitaly feature flags

See merge request gitlab-org/gitlab-ce!25624