In Rails 6, content_type now returns the complete header. We use
media_type to just get the MIME type portion

See https://github.com/rails/rails/pull/36034

Removes patches that are already in Rails 6:
Gitlab::ContentDisposition patch
ActiveRecord::QueryCache patch
ActiveJob::Arguments patch
Gitlab::ActionViewOutput patch

Updates Activerecord::Locking::Optimistic patch to follow changes in
https://github.com/rails/rails/blob/v6.0.1/activerecord/lib/active_record/locking/optimistic.rb

Fix missing timezone for datetime_with_timezone by adding this custom
type to ActiveRecord's time_zone_aware_attributes

There are also minor changes to keep the Rails generated files
similar to when generating a new Rails 6 application

grape_logging was upgraded to fix deprecation messages related to
ActionDispatch::Http::ParameterFilter

Rails 6 now adds the nonce to style-src by default. We disable
this because we still have a lot of code that set inline styles
and we need 'unsafe-inline'

Move SpamCheckService into spam folder

See merge request gitlab-org/gitlab!23915

Support design repo in project namespace transfer

See merge request gitlab-org/gitlab!23573

Delete a comment

See merge request gitlab-org/gitlab!23937

Add a `class_name: "::Project"` to a `belongs_to :project` in a spec

Closes #199424

See merge request gitlab-org/gitlab!23979

Merge branch '39505-extend-the-ability-to-clone-a-dashboard-so-it-would-copy-the-custom-metrics' into 'master'

Extend the ability to clone a dashboard so it would copy the custom metrics

See merge request gitlab-org/gitlab!21923

Fix missing 'Pipeline schedules' link

Closes #199088

See merge request gitlab-org/gitlab!23842

- Add test case for FOSS and EE project and group navbar structure.

Feature flag: adding of use_core_delta_islands

See merge request gitlab-org/gitlab!23850

Remove Elastic Stack cluster application feature flag

See merge request gitlab-org/gitlab!23058

Enable the app by default

To make metrics dashboard clonning fully function, we need to inclued
custom metrics defined by user.

Update Dependency Proxy to ultimate only

See merge request gitlab-org/gitlab!23925

update link to BATS

See merge request gitlab-org/gitlab!23866

docs: Revise upgrade versions in update readme

See merge request gitlab-org/gitlab!23952

Optimize ref name lookups in archive downloads

See merge request gitlab-org/gitlab!23890

More explicit Praefect documentation

See merge request gitlab-org/gitlab!23853

After another demo with the team, the configuration docs weren't
explicit enough. This change updates the docs to be even more explicit.

Add only backend API for view arbitrary commit in merge request - issue #62817

See merge request gitlab-org/gitlab!23701

Fix nav link in security submenu

See merge request gitlab-org/gitlab!23775

Changed color of allowed to fail badge from danger to warning

See merge request gitlab-org/gitlab!23437

The color was not inline with our color design guidelines and was giving
off the impression of an error.

Allow custom Guard command

See merge request gitlab-org/gitlab!23947

Upgrade Gitaly to v1.85.0

See merge request gitlab-org/gitlab!23945

This upgrade deprecates the branch parameter in UserSquash and removes
the revision parameter from GetAllLFSPointersRequest.

Make attr_encrypted thread-safe

Closes #199083

See merge request gitlab-org/gitlab!23955

Fixed Vue file browser not working with special characters

Closes #199308

See merge request gitlab-org/gitlab!23921

Improve pages custom CA docs

See merge request gitlab-org/gitlab!22513

Add section on DNS stubbing to documentation

Closes #198663

See merge request gitlab-org/gitlab!23800

Refactor gl dropdown.js

See merge request gitlab-org/gitlab!20488