Fix CI requests concurrency

See merge request !8760

Backport changes introduced by https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1078

See merge request !8657

Fix mini-pipeline stage tooltip text wrapping

Closes #27014

See merge request !8771

Display fullscreen button on small screens

Closes #19891

See merge request !5302

EE backport for new application settings update service

See merge request !8665

Fix spec failure due to timestamp ordering issue in mySQL

Closes #26622

See merge request !8778

Fix 500 error for Group#web_url method if nested group

See merge request !8743

Nested groups feature improvemetns

See merge request !8448

Update enviroments.md - example CURL requests had a typo in the URL

See merge request cd ../gdk-ee/

Enable HAML-LINT linters phase 2

Closes #22072

See merge request !8566

Fixed error with filter keyboard tests

See merge request !8777

Only show Merge Request button when user can create a MR

See merge request !8639

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Support notes without a project (personal snippets notes)

See merge request !8468

Issue filter now appends a space & the test wasn't taking this into
account when checking the value

Grapify last endpoint of the branches API

See merge request !8755

`can?` already includes the `feature_available?` check, so no need to
check this again.

In case Merge Requests are disabled on the project, no one should see
the Merge Request button.

The project was not public and this caused a 404. So the tests were
giving deceiving results.

By searching for the Merge Request button in `#content-body` this
is overcome, and also other Merge Request buttons (e.g. in the
sidebar) are ignored.

Make diff discussions more reliable

Closes #23646

See merge request !8378

The conflict happens when we try to update a build,
but fail to do so due to fact that we update the same build concurrently for two different runners.

Only render the list if it is visible

See merge request !8710

Fixed keyboard navigation not working in filtered search bar

Closes #26840

See merge request !8656

Add redis version to info rake task

See merge request !8283

Add an eslint rule to flag extra newlines

See merge request !8137

Create a util for normalizing headers on the frontend

See merge request !8750

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/27014