Backport API changes needed to fix sticking in EE

See merge request !10376

Merge branch '29539-fix-pipelines-container-width-with-parallel-diff-for-9-0-stable-merge' into '9-0-stable'

Reset container width when switching to pipelines MR tab -- `9-0-stable` merge edition

See merge request !10424

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/29539

Conflicts:
	app/assets/javascripts/commit/pipelines/pipelines_table.js
	app/assets/javascripts/merge_request_tabs.js
	spec/javascripts/commit/pipelines/pipelines_spec.js

Fix GitHub importer for PRs of deleted forked repositories

Closes #29541

See merge request !9992

Fix name colision when importing GitHub pull requests from forked repositories

Closes #29034

See merge request !9719

Fixes method not replacing URL parameters correctly

Closes #30264

See merge request !10351

Fix race condition where a namespace would be deleted before a project was deleted

Closes #30334 and #30306

See merge request !10389

Remove unnecessary ORDER BY clause when updating todos

See merge request !10399

Fixed labels icon being hidden in collapsed issuable sidebar

Closes #29751

See merge request !10107

API: Make the /notes endpoint work with noteable iid instead of id

Closes #29871

See merge request !10258

Remove unnecessary ORDER BY clause from `forked_to_project_id` subquery

See merge request !10334

Fix environment folder route when special chars present

Closes #29922

See merge request !10250

Add subnav height to sidebar scroll calculation

Closes #30063

See merge request !10262

Merge branch '30098-banzai-filter-mergerequestreferencefilter-has-an-n-1-query-problem' into 'master'

Resolve "Banzai::Filter::MergeRequestReferenceFilter has three N+1 query problems"

Closes #30098

See merge request !10252

Allow users to import GitHub projects to subgroups

Closes #30289 and #30148

See merge request !10344

30276 Move issue, mr, todos next to profile dropdown in top nav

Closes #30276

See merge request !10347

Support wider range of monitored environments with Prometheus

Closes #29874

See merge request !10159

Fix linking to new issue with selected template

Closes #26595

See merge request !10155

Make CI build to use optimistic locking only on status change

Closes #29679

See merge request !10152

[ci skip]

Prevent private group disclosure via parent_id

See merge request !2077

Use full path for moving directories when changing namespace path

See merge request !2078

[ci skip]

Do not retry jobs multiple times when retrying a pipeline

Closes #30092

See merge request !10249

Optimize labels finder query

See merge request !10248

Resolve "Milestone with due date shows escaped HTML"

Closes #30035

See merge request !10224

Fix "N changed files" link toggler jumping to top

Closes #29414

See merge request !10126

Triggers docs

See merge request !10050

Fix the 8.17 to 9.0 upgrade guide

Closes #29860

See merge request !10183

Add notes about dropping support for Ruby 2.1.x

See merge request !10170

Move the 9.0.0 CHANGELOG entries to the top

See merge request !10136

Update Impersonation tokens docs

See merge request !10055

Better priority sorting

Closes #28754

See merge request !9938

Use gitlab-workhorse 1.4.2

See merge request !10205

Add sidebar class to build & wiki pages

Closes #29964

See merge request !10196

Fixed pagination in projects & snippets on user page

Closes #29624

See merge request !10048

Fixed the filter bar not working in IE

Closes #29742

See merge request !10149