Web IDE & Codesandbox POC

Closes #47268

See merge request gitlab-org/gitlab-ce!19764

Fix GPG status badge loading regressions

Closes #49878, #49870, gitlab-org/quality/nightly#6 et #49831

See merge request gitlab-org/gitlab-ce!20987

This enables JavaScripts projects to have live previews straight in the
browser without requiring any local configuration. This uses the
CodeSandbox package `sandpack` to compile it all inside of an iframe.

This feature is off by default and can be toggled on in the admin
settings. Only projects with a `package.json` and a `main` key are
supported.

Updates happen in real-time with hot-reloading. We just watch for
changes to files and then send them to `sandpack` to allow it to reload
the iframe. The iframe includes a very simple navigation bar, the text
bar is `readonly` to stop users navigating away from the preview and
the back and forward buttons just pop/splice the navigation stack
which is tracked by a listener on `sandpack`

There is a button inside the iframe which allows the user to open the
projects inside of CodeSandbox. This button is only visible on
**public** projects. On private or internal projects this button
get hidden to protect private code being leaked into an external
public URL.

Closes #47268

Resolve "Improve JUnit support"

See merge request gitlab-org/gitlab-ce!21067

Update where to find the triaging bot

Closes gitlab-org/quality/team-tasks#36

See merge request gitlab-org/gitlab-ce!21065

improve gitaly on seperate server storage details

See merge request gitlab-org/gitlab-ce!21036

Web IDE context header redesign

Closes #47768

See merge request gitlab-org/gitlab-ce!20850

Resolve "Mutual SSL Auth For Helm TIller"

Closes #48098

See merge request gitlab-org/gitlab-ce!20928

Group todos

See merge request gitlab-org/gitlab-ce!20675

Backport of gitlab-ee!6767

See merge request gitlab-org/gitlab-ce!21037

Resolve "Recover reverted fixes to Merge Request refactor regressions"

Closes #49242, #49343, #48876, #48877, #48817, #48602, and #49843

See merge request gitlab-org/gitlab-ce!20968

Add omnibus setting examples for standalone gitaly server

See merge request gitlab-org/gitlab-ce!21049

Resolve "System level labels UI broken"

Closes #48456

See merge request gitlab-org/gitlab-ce!21046

Avoid N+1 on MRs page when metrics merging date cannot be found

Closes #47613

See merge request gitlab-org/gitlab-ce!21053

Resolve "Frontend for clarifying the usefulness of the search bar"

Closes #36409

See merge request gitlab-org/gitlab-ce!20537

Fix typo and improve formatting

See merge request gitlab-org/gitlab-ce!21056

Update git rerere link in docs

See merge request gitlab-org/gitlab-ce!21060

The original link was moved.

Add documentation for setting up a user status

See merge request gitlab-org/gitlab-ce!21045

Send resize parameters for avatars

See merge request gitlab-org/gitlab-ce!20966

Update CreateItemDropdown class to allow the glDropdown filterRemote option

See merge request gitlab-org/gitlab-ce!21041

Resolve "Improve Auto DevOps settings flow for admin and project"

Closes #47156

See merge request gitlab-org/gitlab-ce!20946