MR zindex regression

Closes #32216

See merge request !11344

Conflicts:
	app/assets/stylesheets/pages/merge_requests.scss

Improve slash command stripping, escape temporary note contents

Closes #32016

See merge request !11341

Added ci-error class and applied a right margin to the ci error widget state

See merge request !11353

Fix notify_only_default_branch check for Slack service

See merge request !11154

Adds left connector class to the rendered graph

Closes #31053

See merge request !11179

Update tree_helper.rb to fix #31784, which broken file browse where paths deeper than 6:'/'.

Closes #31784

See merge request !11197

Fix broken margin in pipeline graph

Closes #32077

See merge request !11239

Fix slash commands detection in comments

Closes #32016

See merge request !11265

Adding NULL:false constraint with change_column_null instead of change_column

Closes #32450

See merge request !11471

Fix realtime edited text for issues

See merge request !11375

Check if OLD is set when migrating issue assignees

Closes #32439

See merge request !11461

Fix data migration from trigger schedules

See merge request !11460

[ci skip] Add edited component for issue_show

Added tests for issue_title_description use of edited and for edited itself

Fix handling is_edited for realtime edit text

Fix tests failures due to whitespace changes

Update edited.vue to include required and default props

Fix deletion of issue assignees for MySQL

See merge request !11426

Improve migration for Multipple issue assignee feature

See merge request !11417

Relax rake backup regex to handle CE and EE RCs

See merge request !11345

Remove unnecessary cache definition in rake karma test

Closes #32119

See merge request !11306

Only rename namespaces and projects with an invalid path

See merge request !11338

Fix failing backup filename spec for RCs

See merge request !11318

Fix transient job failures relating to "unhandled Promise rejection" in issue boards

Closes #32030

See merge request !11222

Make all Serializers receive `current_user` instead `user` [CE]

See merge request !11254

Retried in database

Closes #25737

See merge request !11115

Security patches -> `9-2-stable`

See merge request !11234

Use GroupsFinder to find subgroups the user has access to

See merge request !2096

New Hamlit XSS fix, does not include extraneous changes

See merge request !2095

Refactor snippets finder & dont return internal snippets for external users

See merge request !2094

Fix XSS in branches dropdown

See merge request !2093

Respect project features in wiki and blob search

See merge request !2089

Fix snippets visibility for show action - external users can not see internal snippets

See merge request !2087

Sanitize submodule URLs before linking to them in the file tree view

See merge request !2084