API: Use `visibility` as string parameter everywhere

Closes #27501

See merge request !9337

Override the `ApplicationSetting` default visibility_level setters so
they accept strings & integers for the levels.

Removes random border on event items on mobile

See merge request !9654

Use full group name in GFM group reference title

See merge request !9642

Add filter and sorting to dashboard groups page

See merge request !9619

Update Rubyzip to 1.2.1

Closes #28933

See merge request !9660

Add docs on how to install GitLab on GCP

Closes #28868

See merge request !9662

[ci skip]

Remove deprecated build status badge and related services

Closes #14757

See merge request !9620

Don't copy tooltip when copying GFM

Closes #28802

See merge request !9563

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Correct the return code description for 204

See merge request !9648

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

CORS: Whitelist pagination headers

Closes #28405

See merge request !9651

Remove jQuery UI

Closes #18437

See merge request !9649

Add `visibility` & `visibility=` methods to the
`Gitlab::VisibilityLevel` module so the `visibility_level` can be
get/set with a string value.

And add changelog entry.

Use strings for the ApplicationSetting properties:
 - restricted_visibility_levels
 - default_project_visibility
 - default_snippet_visibility
 - default_group_visibility

Because environments also expose the project, ensure the projects are
exposed as they were before in API v3.

Instead of exposing the VisibilityLevel as Integer, expose it as
String `visibility`.

Fix updaing commit status when using optional attributes

Closes #28656 and #25784

See merge request !9618

API issues - support filtering by iids

Closes #28257

See merge request !9541

cleanup SSH key details

Closes #28896

See merge request !9643

Enable filtering milestones by search criteria in the API

Closes #28807

See merge request !9606

It was taking up space when it didn't really need to be taking up space

jQuery UI is no longer used anywhere so say goodbye to it from package.json & Gemfile

Merge branch '28805-download-archive-with-branch-like-feature-xxxx-add-extra-directory-level' into 'master'

Ensure archive download is only one directory deep

Closes #28805

See merge request !9616

Instead of exposing the VisibilityLevel as Integer, expose it as
String `visibility` for Project and ProjectSnippet.

Filter queries also accept the `visibility` as String instead of
`visibility_level` as Integer.

Also remove the `public` boolean.

For the API, the VisibilityLevel will be exposed as String instead of
Integer. So add the string values and method to translate a level
integer to a string.

- Also remove a redundant test

Add internal endpoint to notify post-receive to Gitaly

See merge request !8983

Fix ES6 interpolation in GitLabCrop class

Closes #28647

See merge request !9624