Use FastDestroy for deleting uploads

Closes #46069

See merge request gitlab-org/gitlab-ce!20977

Add CI/CD build encrypted tokens (after revert)

Closes #52342

See merge request gitlab-org/gitlab-ce!23649

Fixed misreported error codes and elaborated

See merge request gitlab-org/gitlab-ce!23642

Add a flag to use a subquery for group issues search

See merge request gitlab-org/gitlab-ce!23445

Document `/help` tests

See merge request gitlab-org/gitlab-ce!23469

Update gitlab runner helm chart to 0.1.39

Closes gitlab-runner#3807

See merge request gitlab-org/gitlab-ce!23633

Brings back 1e8f1de0 reverted in !23644

Closes #52342

See merge request gitlab-org/gitlab-ce!23436

Fix broken seeder 11.6

Closes #54949

See merge request gitlab-org/gitlab-ce!23608

Truncate merge request titles with periods instead of ellipsis

Closes #54862

See merge request gitlab-org/gitlab-ce!23558

Add section about enabling feature flag in development

See merge request gitlab-org/gitlab-ce!23634

Pass commit when posting diff discussions

See merge request gitlab-org/gitlab-ce!23371

Dropdown: Make Identicons of a subgroup in the breadcrumb dropdown not take a whole line

Closes #51138 and #54026

See merge request gitlab-org/gitlab-ce!23062

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54862

Remove un-used data from discussions endpoint

Closes #54288

See merge request gitlab-org/gitlab-ce!23570

Documentation for Group-level Kubernetes cluster configuration

See merge request gitlab-org/gitlab-ce!22804

Revert "Merge branch 'fix/gb/encrypt-ci-build-token' into 'master'"

See merge request gitlab-org/gitlab-ce!23644

We don't need a series of attributes to render diff files on
discussions.json request. Therefore this MR removes lots of unnecessary
attributes from the request, mainly the highlighted diff lines, which
are pretty expensive.

This reverts commit 1e8f1de0, reversing
changes made to 62d97112.

Group level labels can be used in subgroups and projects

See merge request gitlab-org/gitlab-ce!23643

Docs: fixes blockquotes syntax

See merge request gitlab-org/gitlab-ce!23638

Move default brand title to a method

See merge request gitlab-org/gitlab-ce!23632

Upgrade gitlab-ui dependency

See merge request gitlab-org/gitlab-ce!23611

Disable Sidekiq feature flag check if features table does not exist

Closes #54718

See merge request gitlab-org/gitlab-ce!23639

Security update of gem rails to version 4.2.11

See merge request gitlab-org/gitlab-ce!23520

Documentation mixed up 406 and 405 error codes, this corrects that

Also elaborated on the possible ways you can receive a 405 error code

See spec test: https://gitlab.com/powisj/gitlab-ce/blob/master/spec/requests/api/merge_requests_spec.rb#L848

Change dropdown divider color to gray-200 (#dfdfdf)

See merge request gitlab-org/gitlab-ce!23592

Add feature flag for workhorse content type calculation

See merge request gitlab-org/gitlab-ce!22667

remove_file_uploads should be called both with and w/o
the flag - we need to decide which way to use on instance level.

These options are then used when setting before destroy callback.

Fast destroy is used only if the feature flag is enabled, otherwise
uploads are still deleted using carrier wave. It's disabled by default.

It gathers list of file paths to delete before destroying
the parent object. Then after the parent_object is destroyed
these paths are scheduled for deletion asynchronously.

Carrierwave needed associated model for deleting upload file.
To avoid this requirement, simple Fog/File layer is used directly
for file deletion, this allows us to use just a simple list of paths.