Resolve "Follow-up from "Resolve "API to get all project/group members returns duplicates"""

Closes #62284

See merge request gitlab-org/gitlab-ce!28887

Adding, destroying and toggling emoji previously lacked services and
instead were performed through methods called on Awardable models.

This led to inconsistencies where relevant todos would be marked as done
only when emoji were awarded through our controllers, but not through
the API. Todos could also be marked as done when an emoji was being
removed.

Behaviour changes

- Awarding emoji through the API will now mark a relevant Todo as done
- Toggling an emoji off (destroying it) through our controllers will no
  longer mark a relevant Todo as done

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63372

This finder class acts more as a service, as it only returns mapped
data.

Renaming this class allows us to create a new AwardEmojiFinder without
the ambiguity of there being two similarly-named finders.

https://gitlab.com/gitlab-org/gitlab-ce/issues/63372

This reverts merge request !30613

Kubernetes deployments on new clusters will now have
a separate namespace per project environment, instead
of sharing a single namespace for the project.

Behaviour of existing clusters is unchanged.

All new functionality is controlled by the
:kubernetes_namespace_per_environment feature flag,
which is safe to enable/disable at any time.

API endpoints for requesting container repositories
and container repositories with their tag information
are enabled for users that want to specify the group
containing the repository rather than the specific project.

Use NotesFinder to fetch notes on API and Controllers

Closes #52123

See merge request gitlab-org/gitlab-ce!31300