For directories application_settings --> labels.

Partially addresses #47424.

We have `#allows_multiple_assignees?` defined in CE too, and `take(1)` appears
to be equivalent to `[0, 1]`.

The NotificationService has to do quite a lot of work to calculate the
recipients for an email. Where possible, we should try to avoid doing this in an
HTTP request, because the mail are sent by Sidekiq anyway, so there's no need to
schedule those emails immediately.

This commit creates a generic Sidekiq worker that uses Global ID to serialise
and deserialise its arguments, then forwards them to the NotificationService.
The NotificationService gains an `#async` method, so you can replace:

    notification_service.new_issue(issue, current_user)

With:

    notification_service.async.new_issue(issue, current_user)

And have everything else work as normal, except that calculating the recipients
will be done by Sidekiq, which will then schedule further Sidekiq jobs to send
each email.

Fix 404 in group boards when moving issue between lists

Closes #44551

See merge request gitlab-org/gitlab-ce!18064