Fix slash commands detection in comments

Closes #32016

See merge request !11265

Remove sidebar bundle spec

Closes #32045

See merge request !11223

Issue API change: assignee_id parameter and assignee object in a response

See merge request !11271

Implement auxiliary blob viewers

See merge request !11195

Fix flickering of system notes

Closes #32087

See merge request !11281

Merge branch '31625-tag-editor-loses-all-inputs-when-you-try-to-add-a-tag-that-already-exists' into 'master'

Resolve "Tag editor loses all inputs when you try to add a tag that already exists"

Closes #31625

See merge request !11155

Fix aria labels on custom notifications modal

Closes #32094

See merge request !11256

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/32087

Easy reproduction:

 1. Edit an issue title
 1. Notice the system note added
 1. Switch to another tab and back (to fire the polling immediately)
 1. Notice the flicker (without this fix)

Find the nothing-here-block before asserting page content when on explore page of shortcuts_spec.rb

See merge request !11250

Hide GCP install guide from index page until our image is released

Closes omnibus-gitlab#2326

See merge request !11213

Retried in database

Closes #25737

See merge request !11115

Track pending requests in AjaxCache

See merge request !11170

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

See merge request !11254

Resolve "Use consistent style for trailing commas"

Closes #27144

See merge request !11063

Add "API" to API docs

Closes #32105

See merge request !11261

# Conflicts:
#   doc/install/README.md

Security patches -> `master`

See merge request !11230

Merge branch '31474-issue-boards-sidebar-milestone-dropdown-should-not-be-multi-select' into 'master'

Resolve "Issue boards sidebar milestone dropdown should not be multi select"

Closes #31474

See merge request !11084

Post-deploy to clean `pending_delete` projects

Closes #20984

See merge request !11044

Fixed the stage title translation in cycle analytics

See merge request !11252

Center all empty states

Closes #30949

See merge request !11249

Center related merge request items horizontally

See merge request !11163

Remove unused toggle from diff discussion diff headers

See merge request !11192

Load tree readme asynchronously

See merge request !11191

Use the EnforcedStyleForMultiline: no_comma option.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Use the EnforcedStyleForMultiline: no_comma option.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Replace old isObject for underscore methods

Closes #30317

See merge request !11124