This adds a minimum interval to BackgroundMigrationWorker, ensuring
background migrations of the same class only run once every 5 minutes.
This prevents a thundering herd problem where scheduled migrations all
run at once due to their delays having been expired (e.g. as the result
of a queue being paused for a long time).

If a job was recently executed it's rescheduled with a delay that equals
the remaining time of the job's lease. This means that if the lease
expires in two minutes we only need to wait two minutes, instead of
five.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/41624

Add API for epics

Closes #4250

See merge request gitlab-org/gitlab-ee!3921

Add ability to reorder issues in epic

Closes #3694

See merge request gitlab-org/gitlab-ee!3745

CE upstream - Friday

Closes #3377, gitaly#854, and gitaly#825

See merge request gitlab-org/gitlab-ee!3929

Backport 'Rebase' feature from EE to CE

See merge request gitlab-org/gitlab-ee!3890

# Conflicts:
#	ee/lib/api/epic_issues.rb
#	spec/ee/spec/requests/api/epic_issues_spec.rb

API for epic issues

Closes #4250

See merge request gitlab-org/gitlab-ee!3907

Add group boards API endpoint

Closes #3413

See merge request gitlab-org/gitlab-ee!3663

Fix import project url not updating project name -- EE

See merge request gitlab-org/gitlab-ee!3911

New Crowdin translations

See merge request gitlab-org/gitlab-ee!3930

Some UI polish on Geo pages

Closes #4425

See merge request gitlab-org/gitlab-ee!3863

Resolve "Show DAST results in the MR widget"

Closes #4348

See merge request gitlab-org/gitlab-ee!3885

Use geo-nodes sprite icon where appropriate:
Instead of using the fontawesome globe icon, use the geo-nodes icon
for Geo related action.

Closes gitlab-org/gitlab-ee#4425.