Clean up fix for RegisterJobService
Clean up fix for RegisterJobService

Prefer `each` to `find` since the former does the same thing
except doesn't add the extra delegation step that may be causing
the binding_of_caller gem issues.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/54281#note_119494004

axilleas/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,dreampet/gitlab,dreampet/gitlab,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,iiet/iiet-git,axilleas/gitlabhq,iiet/iiet-git