Backend work to comment on vulnerability dismissal

See merge request gitlab-org/gitlab-ee!11162

This change adds columns to the vulnerability_feedback table to support
adding a single plain-text comment for vulnerability feedback items and
specifically for commenting on dismissals of vulnerabilities.
It also adds support for submitting a comment when dismissing a
vulnerability as well as returning the comment-related attributes when
retrieving vulnerability_feedback records.

Fix reviewer roulette when no-one is in a category

See merge request gitlab-org/gitlab-ce!27895

Use correct k8s namespace in Prometheus queries

See merge request gitlab-org/gitlab-ce!27812

Disable HTTP for the nginx-ingress Review App service

See merge request gitlab-org/gitlab-ce!27884

This would return `people.size` before, when it should return `nil`.

Fix epics from sub-groups errors on reorder, delete

See merge request gitlab-org/gitlab-ee!11837

Remove pages domain scheduled for removal

See merge request gitlab-org/gitlab-ce!26227

Domain will be removed by verification worker after 1 week
of being disabled

Give reviewer roulette its own header in the docs

See merge request gitlab-org/gitlab-ce!27883

Clarify that reporters can manage boards

Closes #60794

See merge request gitlab-org/gitlab-ce!27616

Docs aren't reviewed using roulette

Closes #61047

See merge request gitlab-org/gitlab-ce!27876

Resolve "ArgumentError: Trait not registered: timeouted"

Closes #11392

See merge request gitlab-org/gitlab-ee!11948

Reviewer roulette via Danger should take OOO status into account

Closes #57652

See merge request gitlab-org/gitlab-ce!27696

Also regenerate gitlab.pot

Fix letter opener gem error: "undefined method `before_filter' for LetterOpenerWeb::LettersController:Class"

See merge request gitlab-org/gitlab-ce!27769

Extract refactoring from !10755

See merge request gitlab-org/gitlab-ee!11515

Refactor LfsImportService and ImportService

See merge request gitlab-org/gitlab-ce!27255

In order to make `LfsImportService` more reusable, we
need to extract the logic inside `ImportService` and
encapsulate it into the service.

Disable method replacement in avatar loading

Closes #60903

See merge request gitlab-org/gitlab-ce!27866

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