Geo::RepositySyncWorker should attempt to sync all projects

Closes #3259

See merge request !2796

Switch out resolver to mitigate SocketError

See merge request !2809

Make merge request form dropdowns consistent

See merge request !2790

Make go to issue board dropdown style consistent

See merge request !2641

Move "Move issue" to sidebar - EE merge edition

Closes gitlab-ce#34261

See merge request !2715

Fix merges not working when project is not licensed for squash

Closes #3321

See merge request !2817

Fix unsetting credentials data for pull mirrors

Closes #3308

See merge request !2810

Instead of running the sync 10 times, just run it twice and see if the
worker attempts other projects than it did in the first run.

If some projects fail to sync, Geo::RepositySyncWorker should not take
the same set of projects over and over again. But try to sync all of
them.

Closes gitlab-org/gitlab-ee#3259

Add icon for billing

Closes #3297

See merge request !2814

[ci skip]

[ci skip]

Closes #3321

Extend early adopters feature set

Closes gitlab-com/support-forum#2398

See merge request !2816

Remove private token.

See merge request !2813

Docs: update repo mirroring

Closes #3030

See merge request !2808

Spotted in the logs:
https://gitlab.com/gitlab-com/infrastructure/issues/2387#note_39013276

The problem is the resolver, which with a require gets patched.

Fixes bug where mirror trigger builds is nil at project create.

See merge request !2797

CE upstream: Wednesday

Closes gitlab-ce#37147, gitlab-ce#36804, gitlab-ce#36633, gitlab-ce#34323, and gitlab-ci-multi-runner#2696

See merge request !2787

Remove Geo system hooks

See merge request !2644

Add LDAP sync endpoint to Groups API

Closes #2304

See merge request !2785

EE port of enable-new-navigaton-by-default

See merge request !2795

Docs: port article to EE

See merge request !2799

Change wording about the ssh key of Geo nodes admin page

Closes #3290

See merge request !2794