Feature/service desk be

See merge request !1508

Service desk integration

See merge request !1519

Give each elasticsearch worker its own sidekiq queue

Closes #2108

See merge request !1598

CE upstream: Thursday

Closes gitaly#167 and gitaly#177

See merge request !1583

Multi-level container registry images port to EE

See merge request !1594

Noticed there wasn't any tooltip on the clipboard button so I moved to
using `data-clipboard-text` which gets handled by `copy_to_clipboard.js`

 - Prerender data-* attributes for endpoint, enabled, incoming_email to
   hydrate Vue component
 - Use actual /group/project/service_desk endpoint GET/PUT

Address @filipa review

 - Accessible icons
 - nits

@hazelyang metrics,
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519#note_26863100

See merge request gitlab-ce!10109

Conflicts:
	app/services/projects/destroy_service.rb
	spec/lib/gitlab/import_export/all_models.yml

Resolve "Geo: Better handle SSH/git failures"

Closes #1997

See merge request !1542

Add Prometheus active projects to usage data

See merge request !1576

Deploy board - second iteration

See merge request !1327