Resolve "Comment/Description textarea shows a blue border on the left"

Closes #27066

See merge request !8720

Pick security fixes from 8.16.1 et al into master

Closes #26813, #26249, #26259, #26243, #26242

See merge request !8724

Rename endboss -> maintainer, miniboss -> reviewer

See merge request !8719

Handle unsubscribe notification via email

Closes #22619

See merge request !6597

Allow creating protected branches when user can merge to such branch

Closes #22638

See merge request !8458

Remove rogue scrollbars from some issue comments

Closes #25989

See merge request !8652

Allow issue filter submission using mouse only

See merge request !8681

Upgrade OmniAuth Ruby gem to 1.3.2

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/26813

See merge request !2056

Prevent users from creating notes on resources they can't access

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2054

Ensure that only privileged users can access merge requests in the API

See merge request !2053

Fix export files not removed when a user takes over a namespace

See merge request !2051

Fix users being able to delete instance public deployment keys

See merge request !2049

adds events to services api deserialization

Closes #22974

See merge request !8324

Track Mattermost usage

See merge request !1071

[ci skip]

Add hover style for copy icon in commit page header

Closes #26787

See merge request !8619

Use a warning icon for a stage with allowed to fail builds

Closes #21948

See merge request !8503

Change twitter likes URL in README

See merge request !8702

GitLab Pages documentation refactor

Closes #465

See merge request !1072

Use archived trait for project in specs instead model column

See merge request !8635

[ci skip]

CE upstream

Closes gitlab-ce#26785

See merge request !1096

Mattermost fixes

See merge request !8654

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

Force JSON parsing of approvals API response data.

Closes #1575

See merge request !1095

correct the prometheus feature configuration according to https://gitlab.com/git…

See merge request !8703