The `ReferenceExtractor` would return an array of `ExternalIssue`
objects, and then perform `Array#-` to remove the issues
closed. `ExternalIssue`s had `==` defined, but not `hash` or `eql?`,
which are used by `Array#-`.

Hide issue info when project issues are disabled

Closes #19497

See merge request !9083

Stop setting Strict-Transport-Securty header from within the app

See merge request !9341

Improve EE compatibility MR docs [ci skip]

See merge request !9681

Fix the `Gitlab::Seeder` monkey patch to disable mail delivery

Closes #27609

See merge request !9678

Hides the tooltip on scroll

See merge request !9653

Fix runner tags assignment when retrying a job

Closes #28846

See merge request !9612

EE MR should be updated before CE MR is merged.
Suggest using "git rerere".

Use iids as filter parameter

Closes #27532

See merge request !9096

Decrease tanuki logo size

Closes #28935

See merge request !9676

Default to dangerous MR merge button

Closes #28010

See merge request !9245

Remove now unnecessary `additional_rules!` method from GroupPolicy

See merge request !9595

Fix creating a file in an empty repo using the API

Closes #28626

See merge request !9632

Only add a newline in Markdown Editor if the current line is not empty

Closes #27978

See merge request !9455

Fixes Tech debt: No need to pass svgs as props into Vue with Webpack

Closes #27692 and #27840

See merge request !9522

Resolve "missing count badge styling in new sidebar dropdown"

Closes #28410

See merge request !9592

Update yarn.lock after the removal of jquery-ui

See merge request !9670

remove extra whitespace on dashboard projects page

Closes #28874

See merge request !9617

Removed some unused JS deps

See merge request !9652

Fixed the position of loading spinner

Closes #28906

See merge request !9658

Remove side padding from expanded sidebar

See merge request !9634

Hightlight linenumber on page load

Closes #28893

See merge request !9664

Backport EE changes. Service method should be `get` and not `all`

See merge request !9672

Remove bundle-audit ignores that are no longer applicable

See merge request !9671

Add missing association for mock_ci_service

See merge request !9668

Cleaning up navigational order - Project

Closes #26348

See merge request !9272

Show public RSS feeds to anonymous users

Closes #2629

See merge request !9596