Fix regression in rendering Markdown references that do not exist

Closes #30972

See merge request !10716

Fix appending state to issuable references

Closes #30874

See merge request !10683

Resolve "Resolve note loading icon gone"

Closes #30622

See merge request !10628

Make instructions clearer

See merge request !10685

Improve error messages when a record is unable to be created for a project

See merge request !10696

Use an icon to indicate whether service template is active

See merge request !10694

Add lighter colors and fix existing light colors

See merge request !10690

Centered empty state for issues

Closes #30872

See merge request !10689

Correctly parse katex math in IPyhton notebooks

Closes #30900

See merge request !10678

Prepare for zero downtime migrations

See merge request !9976

Revert "Merge branch 'grpc-1.2.2' into 'master'"

See merge request !10700

Fix registry for projects with uppercases in path

Closes #30880

See merge request !10674

After Trace#limit, we seek to the next line in case

Closes #30796

See merge request !10681

Add auth to topics page

See merge request !10643

Documentation topic: Authentication

Closes #30744

See merge request !10608

Resolve "Update Pipelines documentation"

Closes #27755

See merge request !10600

Fix NUMBER_OF_TRUNCATED_DIFF_LINES re-definition error

See merge request !10664

Update merged icon

See merge request !10635

Use gRPC 1.2.2

Closes #30766

See merge request !10589

Fixed missing capitalisation on buttons

See merge request !10631

Improve discussion_comments_spec perf

See merge request !10648

Hide new subgroup button if user has no permission to create one

Closes #30139

See merge request !10627

Backport Git-env code from EE "Fix push rules on Git 2.11" (gitlab-org/gitlab-ee!1525)

See merge request !10547

Use avatars instead of icons in activity view

See merge request !10596

Fix issue's note cache expiration after delete

Closes #30457

See merge request !10461

Add link to environments on kubernetes.md

See merge request !10555

Fix recent searches icon alignment in Safari

Closes #30642

See merge request !10606

Api fix build events rename to Job events

Closes #30412

See merge request !10586

Return nil as coverage instead of a File object

See merge request !10633

Indent system notes on desktop screens

Closes #30858

See merge request !10667

Use preload to avoid Rails using JOIN

See merge request !10666

New git index

See merge request !10349

Fix subgroup repository disappearance if group was moved

Closes #30261

See merge request !10414

Disclaimer for testing guide not be be used in prod

See merge request !10468

Change project view default for existing users and anonymous visitors to files+readme

Closes #29926

See merge request !10498

Fix "Generate new recovery codes using SSH" documentation link

See merge request !10512

Backport of EE changes in environments tests

See merge request !10528