Improve service desk settings frontend code

See merge request gitlab-org/gitlab!51936

Improve code as a result of
https://gitlab.com/gitlab-org/gitlab/-/issues/288339

This commit:

- Fixes `service_desk_root.vue` `incomingEmail` prop from being mutated
- Removes data properties in the Vue root component
- Converts root component props to provide/inject
- Removes an event hub in favour of component events
- Removes service class
- Completely overhauls the related tests

Add PG trigger for has_external_issue_tracker

See merge request gitlab-org/gitlab!51852

We cache whether a project has an External Issue Tracker integration
enabled in the `has_external_issue_tracker` column on `projects`. It
will be `TRUE` if the project has any integration (a record in
`services`) with a category of "issue_tracker" enabled.

This was previously maintained with application code.

This cache is easy to fall out of consistency when we fail to maintain
it during bulk operations (including PostgreSQL cascading deletes
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48163/) as
mentioned in:

- https://gitlab.com/gitlab-org/gitlab/-/issues/273574#note_457006686
- https://gitlab.com/gitlab-org/gitlab/-/issues/289798

As Ecosystem is increasingly changing integration data using bulk
operations this has been changed to be maintained through a PostgreSQL
trigger.

https://gitlab.com/gitlab-org/gitlab/-/issues/290715
https://gitlab.com/gitlab-org/gitlab/-/issues/289798

Add finder class for fetching commits with a certain Git trailer set

See merge request gitlab-org/gitlab!49243

Remove duplicated shared examples

See merge request gitlab-org/gitlab!52083

Merge branch '296948-container-and-package-list-ui-polish-condense-spacing-to-match-issues' into 'master'

Reduce vertical padding of registry list item

See merge request gitlab-org/gitlab!51961

Work around vue/one-component-per-file violations

See merge request gitlab-org/gitlab!51626

Update Workhorse to v8.60.0

See merge request gitlab-org/gitlab!51965

This class fetches all commits in a range in batches, selecting only
commits with a certain trailer set. This class will be used to fetch the
commits that should be used to generate a changelog.

This builds on the changes introduced in
https://gitlab.com/gitlab-org/gitaly/-/merge_requests/2842 and
https://gitlab.com/gitlab-org/gitaly/-/merge_requests/2999. To take
advantage of these changes, we also bump the Gitaly Gem version and add
fallback code for getting trailers using Rugged; as Rugged is still in
use. In addition, we change the merge_request_diff_commits table and the
MergeRequestDiffCommit model to support storing the trailers as JSON.

See https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/1365 for
more information.

Add improved copy and rename the files

See merge request gitlab-org/gitlab!51757

Fix top border-radius of the login box

See merge request gitlab-org/gitlab!51950

Apply GitLab UI button styles to button _blank_state_ee_trial

See merge request gitlab-org/gitlab!51778

Move Danger code from lib/ to tooling/ [RUN ALL RSPEC]

See merge request gitlab-org/gitlab!51566

These were added because of Rails eagerload.
These files are now moved out of Rails eagerload path,
so the conditionals are not necessary.

Test deprecation of `text/plain` on all endpoints

See merge request gitlab-org/gitlab!46133

This reverts commit 3211640a.

Remove custom Danger check for frozen_string_literal comments

See merge request gitlab-org/gitlab!51930

Add metric definitions to Product Intelligence Dangerfile

See merge request gitlab-org/gitlab!52073

Add basic components for packages settings

See merge request gitlab-org/gitlab!51883

- source
- test
- snapshots

Add missing test coverage on Group API spec

See merge request gitlab-org/gitlab!52055

Migrate EE MrWidgetOptions spec to @vue/test-utils

See merge request gitlab-org/gitlab!51926

Fix a Bundler deprecation

See merge request gitlab-org/gitlab!51995

Add auto-fix Label

See merge request gitlab-org/gitlab!50657

We need to assign a special label to identify bot's MRs

This is redundant with Rubocop's Style/FrozenStringLiteralComment cop,
which we didn't have enabled when this was introduced.

To preserve the same behaviour we also:

- Switch to `EnforcedStyle: always_true`, to forbid `false` values.
- Replace the wildcard list with an explicit list of all violations,
  so we still catch all newly added files.

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

[RUN ALL RSPEC] Print out remaining deprecations

See merge request gitlab-org/gitlab!51820

Fix ActiveRecord::Records flaky spec

See merge request gitlab-org/gitlab!51909

Update links to new issues to fix "Maximum number of comments exceeded" error - 5 of 5

See merge request gitlab-org/gitlab!52063

Update links to new issues to fix "Maximum number of comments exceeded" error - 4 of 5

See merge request gitlab-org/gitlab!52062

Add merge_request_refs_cleanup feature flag

See merge request gitlab-org/gitlab!51558