Correctly parse katex math in IPyhton notebooks

Closes #30900

See merge request !10678

Fix registry for projects with uppercases in path

Closes #30880

See merge request !10674

Resolve "Resolve note loading icon gone"

Closes #30622

See merge request !10628

fix js error in MR remove branch failure handler

Closes #30188

See merge request !10304

Previously only some of the math was getting parsed. This makes it so
that different math options are possible & correctly parsed

Also fixes an issue that meant HTML was being outputted that could cause
an XSS

Closes #30900

Remove IIFEs from files in cycle_analytics_bundle.js

See merge request !10613

Remove IIFEs in boards_bundle.js

See merge request !10612

Show sub-nav under Merge Requests when issue tracker is non-default

Closes #30779

See merge request !10658

This reverts commit 22726942.

Fix recent searches icon alignment in Safari

Closes #30642

See merge request !10606

Fix the `gitlab:gitlab_shell:check` task

Closes omnibus-gitlab#1993

See merge request !10645

Fix NUMBER_OF_TRUNCATED_DIFF_LINES re-definition error

See merge request !10664

Use avatars instead of icons in activity view

See merge request !10596

Update all instances of "fa-refresh" to "fa-spinner"

Closes #22714

See merge request !10490

Indent system notes on desktop screens

Closes #30858

See merge request !10667

Fix pdflab code including file paths

See merge request !10632

Update merged icon

See merge request !10635

Prepare for zero downtime migrations

See merge request !9976

Use preload to avoid Rails using JOIN

See merge request !10666

Reset New branch button when issue state changes

Closes #21292

See merge request !5962

Add link to environments on kubernetes.md

See merge request !10555

Improve webpack-dev-server compatibility with non-localhost setups.

Closes #27729

See merge request !10604

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/30642

Fixes https://sentry.gitlap.com/gitlab/gitlabcom/issues/26786/

Fix filtered search input width for IE

Closes #30856

See merge request !10662

Add auth to topics page

See merge request !10643

Fixed missing capitalisation on buttons

See merge request !10631

Starting with GitLab 9.1.0 we will no longer allow downtime migrations
unless absolutely necessary. This commit updates the various developer
guides and adds code that is necessary to make zero downtime migrations
less painful.