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

Epic tabs UI fixes

Closes #12193

See merge request gitlab-org/gitlab-ee!14306

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.

Fix broken ee geo specs

See merge request gitlab-org/gitlab-ee!14327

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29938 extended
the cache key with Gitlab::VERSION by default.

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]

[ci skip]

[ci skip]

Merge branch '12245-user-onboarding-calculate-percentagecomplated-instead-of-using-a-hardcoded-value' into 'master'

Resolve "User Onboarding: Calculate `percentageComplated` instead of using a hardcoded value"

Closes #12245

See merge request gitlab-org/gitlab-ee!14260

- Remove hard coded value from tour parts
- Update specs
- Update mock data

[EE] App label warning for deploy boards

See merge request gitlab-org/gitlab-ee!14103

Add Copy to Clipboard CE Backport

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

Resolve "Add Copy to Clipboard Button to Review App Modal"

Closes #11707

See merge request gitlab-org/gitlab-ee!14290

This involves multiple files

This reverts commit 6e26ac0f768061206500db0b0419389775a905d0.

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

Closes #49814

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