Merge branch '17690-Protect-TeamCity-builds-for-triggering-when-a-branch-is-deleted-And-add-MR-option' into 'master'

Skip TeamCity trigger on branch delete and support MR triggers

Closes #13871 and #17690

See merge request gitlab-org/gitlab-ce!29836

Refactor and add version text to variable syntax

See merge request gitlab-org/gitlab-ce!29964

Update pagination prev and next texts

See merge request gitlab-org/gitlab-ce!29911

Add how to migrate deployments for deploy boards

See merge request gitlab-org/gitlab-ce!29872

Enable JIT Kubernetes resource creation for project level clusters

See merge request gitlab-org/gitlab-ce!29515

Memoize non-existent custom appearances

See merge request gitlab-org/gitlab-ce!29957

Docs: Correct group path instructions

See merge request gitlab-org/gitlab-ce!29869

Enable Gitaly ref name caching for discussions.json

See merge request gitlab-org/gitlab-ce!29951

Re-add ignore_column for import columns

See merge request gitlab-org/gitlab-ce!29959

Improve #has_metrics? and Environment#has_terminals?

See merge request gitlab-org/gitlab-ce!29847

Docs: link to predefined env variables reference more evident

Closes #62845

See merge request gitlab-org/gitlab-ce!29857

This `ignore_column` was present for a while but recently removed, but
to ensure we don't get error 500s let's keep it for a while.

This saves about 5 SQL calls per page if no custom appearance is
specified.

This eliminates many potential duplicate FindCommit RPCs for the same
ref, which often occurs in the RelativeLinkFilter#current_commit call.
On the GitLab 12.0 release post, for example, this would save close to
400 RPC calls.

[ci skip]

Add Copy to Clipboard CE Backport

See merge request gitlab-org/gitlab-ce!29906

Resolve "Display in admin area if emails are verified or not"

Closes #49814

See merge request gitlab-org/gitlab-ce!29669

App label warning for deploy boards

See merge request gitlab-org/gitlab-ce!29740

As Auto DevOps deployments both label and annotations, that will be
included in the deploy board so need to warn at all.

Merge branch '63513-ensure-gitlab-jsoncache-includes-the-gitlab-version-in-the-cache-key' into 'master'

Include the GitLab version in the cache key for Gitlab::JsonCache

See merge request gitlab-org/gitlab-ce!29938

Upgrade prettier to latest (v1.18.2)

See merge request gitlab-org/gitlab-ce!29943

Add confirmation for registry image deletion

Closes #42399

See merge request gitlab-org/gitlab-ce!29505

Adds a modal to let the user confirm their action before
proceeding to registry/image deletion

Upgrades prettier to the latest version, and auto-corrects files with
yarn prettier-all-save

The diffs all seem to stem from formatting changes in brackets within
template literals. Nothing major.

Relevant changelogs here:

https://prettier.io/blog/2019/04/12/1.17.0.html
https://prettier.io/blog/2019/06/06/1.18.0.html

Remove Gemnasium dead link from docs

See merge request gitlab-org/gitlab-ce!29942

Documentation for Prometheus Service Discovery

Closes #63110

See merge request gitlab-org/gitlab-ce!29811

Updating documentation to include
Prometheus Service Discovery. Added
monitoring node documentaiton as
well as documentation for the
individual service nodes.

Avoid storing backtraces from Bitbucket Cloud imports in the database

See merge request gitlab-org/gitlab-ce!29862

Make HTML and text emails for new issues uniform and add the mail to mailer previews

Closes #58065

See merge request gitlab-org/gitlab-ce!29886

DroneCI and TeamCity shared the same validations methods
on the data received. These validations were extracted
into a concern

This is a take over from a community contribution:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20990

Skip TeamCity push event when related to branch delete

Support merge request events for TeamCity service.
Add checkbox for merge request triggers in the TeamCity
configuration page.

Mention Container Scanning NFS bug and how to fix it

Closes gitlab-ee#11429

See merge request gitlab-org/gitlab-ce!29908