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.