Upgrade Brakeman to 3.4.1

Closes #26820

See merge request !8629

Simple eslint fixes

See merge request !8536

Mark MR as WIP when pushing WIP commits

Closes #25036

See merge request !8124

Revert "Merge branch 'switch-to-sassc' into 'master'"

Closes #26762

See merge request !8642

This reverts commit e7fdb1aa, reversing
changes made to 78d71038.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/26762

Document presenters

Closes #23563

See merge request !8480

Add documentation for possible causes of JS-related test failures.

See merge request !8214

Fixed some HAML errors on milestone#show

Closes #26799 and #26772

See merge request !8560

Fixed highlightFirst and added specs

Closes #26803

See merge request !8622

Add hover state to MR comment reply button

See merge request !8541

Update project visibility level ui to use dropdowns

Closes #24296, #24123, and #24032

See merge request !7645

Document the `auto_link_ldap_user` setting

See merge request !8568

Add sorting pipelines for a commit

Closes #26117

See merge request !8319

Link external commit status badges to target URLs

Closes #25662

See merge request !8611

Fix Slash command templates

Closes #26042

See merge request !8320

Notify the user who set auto-merge when merge is not possible

Closes #23524

See merge request !8056

Speed up dashboard milestone index by scoping IssuesFinder to user authorized projects

See merge request !8524

Add Slack slash commands to project services list index

See merge request !8636

[ci skip]

Shows current user on top of filtered dropdown list

Closes #26765

See merge request !8612

Fix search bar filter dropdown scrollbars

Closes #26777

See merge request !8615

Fixes big pipeline and small pipeline width problems

Closes #26667

See merge request !8593

better UI fix - simple solution - pipelines#index mini_graph in Vue

See merge request !8614

correct User-agent placement in robots.txt

Closes #26807

See merge request !8623

Refactor cycle analytics stages (1st iteration)

See merge request !7647

Time tracking API

Closes #25861

See merge request !8483