The return result for the source or target branch being missing was
ambiguous before. It should be an empty compare to indicate no
comparison could be done.

This ensures the return value is consistent if the source and/or
branch do not exist.

This should already be done in Gitlab::Git:Compare.

A temp reference is only needed to fetch a branch from another project,
as in the case for forked repositories. For branch comparisons within
the same project, we can just use the existing branch names to do the
comparison.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/38689#note_126107862

Increase timeout for abuse_reports_spec.js to 500ms

Closes gitlab-ee#11229

See merge request gitlab-org/gitlab-ce!27502

Resolve cluster metrics regression

Closes gitlab-ee#11168

See merge request gitlab-org/gitlab-ce!27442

Fixes a regression causing cluster metrics not to display

Bump required Ruby version check to 2.5.3

Closes #60704

See merge request gitlab-org/gitlab-ce!27495

Upgrade Gitaly to 1.34.0

See merge request gitlab-org/gitlab-ce!27494

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/58079

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60704

CE Backport for "Restructure project merge request settings page"

See merge request gitlab-org/gitlab-ce!26834

Fix link issues with labels on project/group labels pages

See merge request gitlab-org/gitlab-ce!24060

* On the project labels page, the label itself should not be clickable.
* On the group labels page, the links for Issues and Merge Requests should be shown.

Merge branch 'ce-11224-flaky-test-projects-audit-events-adding-an-ssh-key-appears-in-the-project-s-audit-events-ee-spec-features-projects-audit_events_spec' into 'master'

Introduce the wait_for helper for system tests

See merge request gitlab-org/gitlab-ce!27483

ssot as principle

See merge request gitlab-org/gitlab-ce!27436

Replace ee-specific code for boards/issue_card_inner

Closes gitlab-ee#10012

See merge request gitlab-org/gitlab-ce!27394

Display "Uninstall App" button if app is uninstallable

Closes #60641

See merge request gitlab-org/gitlab-ce!27423

Fix stylelint rules in boards.scss

Closes #59895

See merge request gitlab-org/gitlab-ce!27458

Move external authorization doc to CE

See merge request gitlab-org/gitlab-ce!27421

- Create empty uninstall_button component.
- Add uninstallable property to application_row component.
- Display Uninstall button if app is uninstallable and it
is installed.

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

Migrate correlation and tracing code to LabKit

See merge request gitlab-org/gitlab-ce!25379

Add instructions on how to contribute a "Built-In" template on projects/new"

Closes #55833

See merge request gitlab-org/gitlab-ce!26976

Only use backslash escapes in autocomplete when needed

Closes #45348

See merge request gitlab-org/gitlab-ce!27457

Improve multi-line suggestion docs

See merge request gitlab-org/gitlab-ce!27465

Fix related merge requests not working with relative URL root

See merge request gitlab-org/gitlab-ce!27475

Update serverless.yml for functions to include only node.js

See merge request gitlab-org/gitlab-ce!27466

Extract discussion actions into separate component

Closes #58293

See merge request gitlab-org/gitlab-ce!27227

Fixes stylelint for dashboard_skeleton

Closes #59830

See merge request gitlab-org/gitlab-ce!27422

Update review.gitlab-ci.yml to fix review-stop

See merge request gitlab-org/gitlab-ce!27478

Doc fixes for the release post 11.10

See merge request gitlab-org/gitlab-ce!27450