Continuation of 426488b7

Prevents refspec as branch name, which would bypass branch protection
when used in conjunction with rebase.

HEAD seems to be a special case with lots of occurrence,
so it is considered valid for now.

Another special case is `refs/head/*`, which can be imported.

Name GitLab managed apps

See merge request gitlab-org/gitlab-ce!27129

QA: Change CI value to something that can be masked

See merge request gitlab-org/gitlab-ce!27146

Docs: Update predefined_variables.md to fix anchor

See merge request gitlab-org/gitlab-ce!27127

Update Okta configuration notes

See merge request gitlab-org/gitlab-ce!27076

Fix default_project_creation already exists

See merge request gitlab-org/gitlab-ce!27144

For those who upgraded to a version that included the previous
backport implementation with migration 20190311132500.

The current value cannot be masked[1] but CI variables default to
masked. Rather than implementing a toggle for the masking control,
simply change the value to something that can be masked.

[1] Currently, "simple" values can be masked:
* it should be a single line
* it should not have escape characters
* it should not use variables
* it should not have any whitespace
* it should be longer than 8 characters

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25476

Backport `add_default_project_creation_setting` to CE

See merge request gitlab-org/gitlab-ce!27141

Fix stage index migration failing in PostgreSQL 10

Closes #59985

See merge request gitlab-org/gitlab-ce!26972

Refactor Issues doc

Closes #56877

See merge request gitlab-org/gitlab-ce!24695

Document IS_GITLAB_EE environment variable

Closes #60131

See merge request gitlab-org/gitlab-ce!27120

Enable ESLint rule jest/no-focused-tests

See merge request gitlab-org/gitlab-ce!27132

Override problematic display with utility class

Closes #60231

See merge request gitlab-org/gitlab-ce!27138

GraphQL complexity limit too low for Schema load / IntrospectionQuery

Closes #60123

See merge request gitlab-org/gitlab-ce!27063

CE: Extract EE specific files/lines for Discussion spec/services

See merge request gitlab-org/gitlab-ce!26950

Edits to documentation dev doc index

See merge request gitlab-org/gitlab-ce!27135

An IntrospectionQuery required more
complexity points.

Fix typo “settings” in Merge requests docs

See merge request gitlab-org/gitlab-ce!27020

Improvements to Documentation style and structure information

See merge request gitlab-org/gitlab-ce!27098

Add test suite with PostgreSQL 10 to be run on a schedule.

Also, move MySQL tests to run only on master branch, and on schedules.

See merge request gitlab-org/gitlab-ce!26920

Also, move MySQL tests to run only on master branch, and on schedules.
Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

Improve performance of PR import

See merge request gitlab-org/gitlab-ce!27121

Extract a Git::HooksService

Closes #15463

See merge request gitlab-org/gitlab-ce!26726

Fix `updated_at` doesn't apply to `state_event` updates of issues via API.

Closes #51279 and #46980

See merge request gitlab-org/gitlab-ce!27124

Externalize strings in flash messages

See merge request gitlab-org/gitlab-ce!27106

- Externalize strings in controllers
- Update PO file

This removes unneeded `.reload` call which
makes AR to load ALL objects, and create its
in-memory representation.