Make CreateGpgSignatureWorker backwards compatible with original method signature

See merge request gitlab-org/gitlab-ee!6776

Older versions of GitPushService push a single commit SHA string to the queue,
but Gitaly requires that the parameters sent by CreateGpgSignatureWorker are
an array. It's possible to have old workers using this original signature or
jobs in the retry queue that would fail if CreateGpgSignatureWorker can't
handle the string form.

Resolve "Billing page style is broken"

Closes #7082

See merge request gitlab-org/gitlab-ee!6773

merge request https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6763

CE upstream - 2018-08-02 00:21 UTC

See merge request gitlab-org/gitlab-ee!6757

Make CNG_PROJECT_PATH configurable for releasing helm charts

Closes charts/gitlab#644

See merge request gitlab-org/gitlab-ee!6760

Resolve "Extract EE specific files/lines for Discussion app/serializers"

Closes #6650

See merge request gitlab-org/gitlab-ee!6762

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Rails 5 fix product array method delagation by manually calling .to_a in NotificationService

See merge request gitlab-org/gitlab-ee!6753

EE Port of gitlab-ce!20851 (Enable frozen string in app/models/*.rb)

See merge request gitlab-org/gitlab-ee!6735

Resolve "Mark experimental ES indexer as beta, not experimental"

Closes #6587

See merge request gitlab-org/gitlab-ee!6384

Ignore sorting parameter when exporting issues to CSV

Closes #4159

See merge request gitlab-org/gitlab-ee!6702

Resolved conflicts:
- app/workers/all_queues.yml
- config/sidekiq_queues.yml
- spec/lib/gitlab/import_export/all_models.yml

CE MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/19480
EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6611

# Conflicts:
#	app/models/ci/build.rb
#	app/workers/all_queues.yml
#	config/sidekiq_queues.yml
#	db/schema.rb
#	locale/gitlab.pot
#	spec/lib/gitlab/import_export/all_models.yml

[ci skip]

Fix scss-lint error

See merge request gitlab-org/gitlab-ee!6755

Add repository languages for projects

Closes #23931, #34671, #48647, and #47301

See merge request gitlab-org/gitlab-ce!19480

Add repository languages for projects

See merge request gitlab-org/gitlab-ee!6611

Enable SCSS linting for EE

Closes #7063

See merge request gitlab-org/gitlab-ee!6750

Add vanilla JS avatar_helper and update existing avatar helpers

See merge request gitlab-org/gitlab-ce!20886

Backport CSS changes from gitlab-ee!6638

See merge request gitlab-org/gitlab-ce!20961

Add license management frontend

Closes #5488

See merge request gitlab-org/gitlab-ee!6638

Resolve "Clean up changelog for 11.1.3 and 11.1.4"

Closes #49837

[ci skip]

See merge request gitlab-org/gitlab-ce!20962