Use px instead of rems to prep for csslab

Closes #55314

See merge request gitlab-org/gitlab-ce!23804

Fix line-height of line numbers

Closes #55278 and #51668

See merge request gitlab-org/gitlab-ce!23775

Fix broken link in feature proposal template

See merge request gitlab-org/gitlab-ce!23957

Resolve "build-loader-animation dots misaligned"

Closes #52620

See merge request gitlab-org/gitlab-ce!23959

Remove deprecated xhr from specs

Closes #55448

See merge request gitlab-org/gitlab-ce!23949

Remove &:not(.use-csslab) from table to fix dark diff themes

Closes #55282

See merge request gitlab-org/gitlab-ce!23941

CE port: Rename GroupHierarchy into ObjectHierarchy

See merge request gitlab-org/gitlab-ce!23923

Resolve "Add tests for "Redesign projects lists UI""

Closes #55359

See merge request gitlab-org/gitlab-ce!23915

Fix sidekiq-reliable-fetch version

Closes sidekiq-reliable-fetch#18

See merge request gitlab-org/gitlab-ce!23937

Removed pipeline_ci_sources_only feature flag

See merge request gitlab-org/gitlab-ce!23926

Upgrade @gitlab/ui to 1.16.2

See merge request gitlab-org/gitlab-ce!23946

Cache avatar URLs and paths within a request

Closes #55355

See merge request gitlab-org/gitlab-ce!23950

Resolve "Hide cluster features that don't work yet with Group Clusters"

Closes #55103

See merge request gitlab-org/gitlab-ce!23935

Merge branch '51606-expanding-a-diff-while-having-an-open-comment-form-will-always-scroll-down-to-the-comment' into 'master'

Resolve "Expanding a diff while having an open comment form will always scroll down to the comment"

Closes #51606

See merge request gitlab-org/gitlab-ce!23849

Adds Vuex Store for the releases page

See merge request gitlab-org/gitlab-ce!23796

Resolve "Sidebar styling updates"

Closes #54814

See merge request gitlab-org/gitlab-ce!23816

In a merge request with many discussions, the avatar URL can be called
thousands of times, inflicting a significant performance penalty
especially when avatars are stored in object storage. To mitigate this
problem, we can just cache the generated path any time it is requested.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55355

Refactor the pipelines for merge requests docs

See merge request gitlab-org/gitlab-ce!23905

SSH docs: clarify that you need to accept the authenticity of the server

Closes #54880

See merge request gitlab-org/gitlab-ce!23584

Docs/make job api docs consistent

See merge request gitlab-org/gitlab-ce!23581

Prevent admins from attempting hashed storage migration on read only DB

See merge request gitlab-org/gitlab-ce!23597

CE: Document the "Abuse reports" feature

Closes #45552

See merge request gitlab-org/gitlab-ce!22932

Update yaml/README.md to clarify allow_failure interaction with stages

See merge request gitlab-org/gitlab-ce!23367

Add FakeApplicationSettings#commit_email_hostname

Closes #54953

See merge request gitlab-org/gitlab-ce!23939

Refactor BroadcastMessage to use Gitlab::JsonCache

See merge request gitlab-org/gitlab-ce!23934

- add tests for merge_request_count
- add tests for show_issue_count
- add tests for explore_projects_tab
- change interface for show_merge_request_count and show_issue_count

Make Projects::DeployKeysController EE-ready

See merge request gitlab-org/gitlab-ce!23911

This commit fixes a number of minor style issues in the job details
sidebar - spacing, font weights, button sizes, and font sizes.

More details here:
https://gitlab.com/gitlab-org/gitlab-ce/issues/54814

Kudos to @eread for feedback!