Add index on namespaces lower(name) for UsersController#exists

Closes #41340

See merge request gitlab-org/gitlab-ce!16059

Explictly require Gitlab::Utils in ProjectFeaturesCompatibility

Closes #41390

See merge request gitlab-org/gitlab-ce!16107

Clarify Auto DevOps pipelines

See merge request gitlab-org/gitlab-ce!16106

Make webpack fail for missing exports

See merge request gitlab-org/gitlab-ce!16005

docs: fix a typo in LFS documentation

See merge request gitlab-org/gitlab-ce!16078

Fix prometheus arg in prometheus.yml

See merge request gitlab-org/gitlab-ce!16075

Replace the download, fork and resolve discussion in a new issue icons

See merge request gitlab-org/gitlab-ce!15436

Update Dependencies

See merge request gitlab-org/gitlab-ce!16073

[ci skip]

For some reason Rails does not require it automatically when invoked via
rake task which cause tasks like seed_fu fail
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Escape spaces to %20 rather than +

See merge request gitlab-org/gitlab-ce!16037

Last push event widget width for fixed layout #40268

See merge request gitlab-org/gitlab-ce!15862

Resolve "Bump Ruby to 2.3.6"

See merge request gitlab-org/gitlab-ce!16016

Update installation and upgrade guides to use Ruby 2.3.6

See merge request gitlab-org/gitlab-ce!16038

Do not show Vue pagination if only one page

Closes #33609

See merge request gitlab-org/gitlab-ce!15999

Added 'admin' persona

See merge request gitlab-org/gitlab-ce!15470

Docs: move article Artifactory + GL to subject-related folder

See merge request gitlab-org/gitlab-ce!16081

Fixed diff_worker not compiling correctly

Closes #41182

See merge request gitlab-org/gitlab-ce!15966

Refactor user, project and group docs when changing namespace

See merge request gitlab-org/gitlab-ce!16019

- move the section
- replace identifiers with inline links
- update settings (General settings > Advanced settings)

Skip projects filter on merge requests search

See merge request gitlab-org/gitlab-ce!15955

Properly name webpack chunks for dynamic imports

See merge request gitlab-org/gitlab-ce!16066

Reduce cardinality of some of GitLab's Prometheus metrics and fix observed duration reporting.

Closes #41045

See merge request gitlab-org/gitlab-ce!15881

Fall back to the `MergeRequestWidgetEntity`

Closes #41296

See merge request gitlab-org/gitlab-ce!16074

Resolve "Decouple multi-file editor from file list"

Closes #40040 and #40032

See merge request gitlab-org/gitlab-ce!15430

Signed-off-by: Rémy Coutable <remy@rymai.me>

When searching for merge requests, an additional subquery
is added which by default filters only merge requests which belong
to source or target project user has permission for.

This filter is not needed because more restrictive filter
which checks if user has permission for target project
is used in the query.

So unless a custom projects filter is used by user, it's possible
to skip the default projects filter and speed up the final query.

Related to #40540