Fixes, at least partially, gitlab-org/gitlab-ce#26755.

Reduce DB-load for build-queues by storing last_update in Redis

See merge request !8084

Document GIT_SUBMODULE_STRATEGY

See merge request !8586

Rename duplicate migrations and skip them if table/columns are already present

Closes #26868

See merge request !8644

The time tracking feature was backported from EE to CE, thus the CE
migrations should be uniquely named and should skip the actual migration
content if the table/columns already exist (that means that the EE
migrations were already performed).
Signed-off-by: Rémy Coutable <remy@rymai.me>

New U2F ineligible message

Closes #26066

See merge request !8392

Add an image to the public access documentation and fix wrong profile path

See merge request !8583

Resolve "Error handling in environments list"

Closes #25507

See merge request !8461

Fixes builds dropdown making request when clicked to be closed

Closes #26601

See merge request !8545

Add margin to math blocks

Closes #26472

See merge request !8543

Replace many :project with :empty_projects in API specs

See merge request !8608

Ensure group acts as a namespace for polymorphic routes

Closes #26810

See merge request !8627

Fix todos spec

See merge request !8643

Signed-off-by: Rémy Coutable <remy@rymai.me>

Autoresize markdown preview

Closes #24372

See merge request !8607

Gitaly feature flag

See merge request !8440

Fix small button alignment issues

See merge request !8631

Add jasmine helpers and run their specs

Closes #26305

See merge request !8437

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

This was changed in a community MR, but the branch was far enough behind
master that it didn't have this spec.

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