Migrate responsive display utilities to their new names

See merge request gitlab-org/gitlab!51918

Render WebP attachments as image by default

See merge request gitlab-org/gitlab!51088

This adds the .webp file extension to the list of safe image extensions
in the file type detection. It allows webp-images to be uploaded to
issues and comments which then get embeded as images instead of
attachments (see [gitlab-org/gitlab#296600](3)). It also allows uploading
of designs in the webp format. WebP is supported in all browsers that
GitLab supports except Safari <= macOS 10
(see [caniuse][1], [suppported browsers][2]).

[1]: https://caniuse.com/webp
[2]: https://docs.gitlab.com/ee/install/requirements.html#supported-web-browsers
[3]: https://gitlab.com/gitlab-org/gitlab/-/issues/296600

Allow user SSH public key endpoint to be publicly accessible again

See merge request gitlab-org/gitlab!52227

A regression caused the User SSH public key endpoint to require
authentication when instance public visibility was restricted.
This endpoint should be available without authentication, matching
the behavior of the /api/v4/users/:id/keys endpoint.

Fix several issues on Datadog integration service form

See merge request gitlab-org/gitlab!51908

* Adding blank query parameters `env` and `service` to the URL
* Accepting blank string on the `:datadog_site` field
* Wrong validation of `:datadog_site` and `:api_url` together when both are blank strings
* Default value for `:datadog_site` not working as intended.
* Test button hangs when testing before saving, with invalid data.

Allow for deletion of a rotation in OncallSchedules

See merge request gitlab-org/gitlab!51905

Hook the frontend for oncall deletions up
to the backend and activating the Apollo cache
allowing users to delete rotations

Move pick_repository_storage logic into Repository

See merge request gitlab-org/gitlab!51959

All usages of display CSS utilities have been updated to reflect their
new names. Here's a summary of those updates:

- gl-display-sm-none -> gl-sm-display-none
- gl-display-md-none -> gl-md-display-none
- gl-display-lg-none -> gl-lg-display-none
- gl-display-sm-flex -> gl-sm-display-flex
- gl-display-md-flex -> gl-md-display-flex
- gl-display-lg-flex -> gl-lg-display-flex
- gl-display-sm-inline-flex -> gl-sm-display-inline-flex
- gl-display-lg-inline-flex -> gl-lg-display-inline-flex
- gl-display-sm-block -> gl-sm-display-block
- gl-display-md-block -> gl-md-display-block
- gl-display-lg-block -> gl-lg-display-block
- gl-display-lg-inline-block -> gl-lg-display-inline-block
- gl-display-lg-table-cell -> gl-lg-display-table-cell

BulkImports: Remove unused `after_run` DSL

See merge request gitlab-org/gitlab!52323

Resolve "Update doc/development/pipelines.md for graphql-verify job"

See merge request gitlab-org/gitlab!52491

Use ResolveResourceParent concern for iterations

See merge request gitlab-org/gitlab!52213

Allow ProjectsController#show in query_limiting

See merge request gitlab-org/gitlab!52473

Move Social connect button to new GitLab UI

See merge request gitlab-org/gitlab!51835

Update steps to find slug for Review App

See merge request gitlab-org/gitlab!52482

Change error message for user approval error

See merge request gitlab-org/gitlab!52103

Add btn-default to settings toggle button in push rules

See merge request gitlab-org/gitlab!52430

Use shared examples for onboarding progress specs

See merge request gitlab-org/gitlab!52325

Fix gitlab:cleanup:orphan_job_artifact_files rake task limit

See merge request gitlab-org/gitlab!52056

Updating 'Operations Dashboard' documentation

See merge request gitlab-org/gitlab!52198

Link back and forth between alerts, the alert field, and the
dashboard documentation to ensure the user sets up alerts correctly,
so they will (later) have success when setting up dashboards.

This dries a little bit the code by reusing same logic from mixin.

Fixed the flaky tests

See merge request gitlab-org/gitlab!52396

Update the Pipeline triggers settings UI text

See merge request gitlab-org/gitlab!51348

Fix BoardSidebarEpicSelect to work in group boards

See merge request gitlab-org/gitlab!51958

- Remove debounceAnimationFrame from board_sidebar_epic_select.vue
(Move mutations inside setActiveIssueEpic action)
- Add cache for fetched epic data in vuex store.
- Add logic for fetching epic if it doesn't exist in cache.
- Remove settingEpic state from BoardSidebarEpicSelect
(It's redundant and we should use epicFetchInProgress from vuex)
- Change the event name onEpicSelect to epic select.

As per review

Preset root ancestor when finding labels

See merge request gitlab-org/gitlab!52236

Add skip_validation attribute to metric definition

See merge request gitlab-org/gitlab!52226