Port of "Require jQuery to be explicitly imported" to EE

See merge request gitlab-org/gitlab-ee!4925

Delete no longer required spec

See merge request gitlab-org/gitlab-ee!4924

Port "Remove sync script for gitlab-svgs" to EE

See merge request gitlab-org/gitlab-ee!4906

Ensure mirror can transition out of the started state when last_update_started_at is nil

Closes #5008 and #5205

See merge request gitlab-org/gitlab-ee!4923

Don't disable Container Registry for CI/CD projects

Closes #5210

See merge request gitlab-org/gitlab-ee!4921

CE upstream - 2018-03-09 00:26 UTC

See merge request gitlab-org/gitlab-ee!4912

We should respect the default state from the application config for
these setting.

Add `?ci_cd_only=true` query parameter to CI/CD GitHub status link

Closes #5194

See merge request gitlab-org/gitlab-ee!4914

Fix crash when checking external authorization license

Closes #5203

See merge request gitlab-org/gitlab-ee!4919

Only check the global feature directly on `License` otherwise we would
also perform the check on the namespace which would cause a crash.

Cleanup and consolidate the CI yaml docs

See merge request gitlab-org/gitlab-ee!4918

Geo: Clarify message about database replication not working

Closes #4924

See merge request gitlab-org/gitlab-ee!4909

Resolve "Add DAST authentication example"

Closes #5147

See merge request gitlab-org/gitlab-ee!4867

EE port of merge-request-widget-source-branch-improvements

See merge request gitlab-org/gitlab-ee!4899

Docs: new article devops + game dev with GitLab

See merge request gitlab-org/gitlab-ee!4868

Put global project approval docs under Merge Request approvals

See merge request gitlab-org/gitlab-ee!4886

Implement foreground verification of CI artifacts (EE)

See merge request gitlab-org/gitlab-ee!4863

EE version of 'Correct permissions for locking discussions'

See merge request gitlab-org/gitlab-ee!4915

Update PG HA documentation

Closes omnibus-gitlab#3018

See merge request gitlab-org/gitlab-ee!4803

Fixes missing bottom margin for the new button custom metrics

See merge request gitlab-org/gitlab-ee!4907

Fix proxy_download support for lfs controller

See merge request gitlab-org/gitlab-ee!4894

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/5194

# Conflicts:
#	app/assets/images/icons.json
#	app/assets/images/icons.svg
#	app/assets/images/illustrations/epics.svg

[ci skip]

Closes #4924

Make 'git fsck' mandatory

See merge request gitlab-org/gitlab-ce!17648