Create issue and merge request destroy services

Closes #39601

See merge request gitlab-org/gitlab-ce!15604

Add in the Oxford comma

See merge request gitlab-org/gitlab-ce!15602

Fix 404 on commits list for branch that doesn't have any files

See merge request gitlab-org/gitlab-ce!15603

Optimise StuckCiJobsWorker

Closes gitlab-com/infrastructure#3260

See merge request gitlab-org/gitlab-ce!15527

Upgrade jQuery to 2.2.4

Closes #40481

See merge request gitlab-org/gitlab-ce!15570

removed 'only once' from the docs

Closes #39261

See merge request gitlab-org/gitlab-ce!15601

ignore hashed repositories when doing rake gitlab:cleanup:dirs

Closes #40352

See merge request gitlab-org/gitlab-ce!15600

Update svg external dependency

See merge request gitlab-org/gitlab-ce!15596

Add article on autoscaling GitLab Runner on AWS

Closes #39650

See merge request gitlab-org/gitlab-ce!15313

Update prometheus Gem to fix compilation on centos 6 due to GCC not recognizing `std=c11` option

Closes omnibus-gitlab#2988

See merge request gitlab-org/gitlab-ce!15598

Fix ProtectedBranch access level validations

See merge request gitlab-org/gitlab-ce!15586

Drastically improve project search performance by no longer searching namespace name

Closes #40510 and #39623

See merge request gitlab-org/gitlab-ce!15590

Add a feedback mechanism to `package-qa` manual action

Closes #40431

See merge request gitlab-org/gitlab-ce!15538

Previously these were duplicated so they could be different for push/merge,
but this was no longer necessary after
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11232

Before an access_level was required in EE even when an
it had been set for a user/group.

Resolve "Update timeago.js"

Closes #40465

See merge request gitlab-org/gitlab-ce!15553

Fix WIP system note not being created

Closes #40374

See merge request gitlab-org/gitlab-ce!15528

Prevent 500 error when inspecting job after trigger was removed

Closes #36400

See merge request gitlab-org/gitlab-ce!15447

Add classList polyfill for IE classList.toggle('foo', force)

Closes #38916

See merge request gitlab-org/gitlab-ce!15552

Fix pulling and pushing using a personal access token with the sudo scope

Closes #40466

See merge request gitlab-org/gitlab-ce!15571