Apply Sidekiq sharding router to Sidekiq::Job::Setter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/149962



Merged-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Approved-by: Gregorius Marco <gmarco@gitlab.com>
Approved-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Co-authored-by: Sylvester Chin <schin@gitlab.com>