Optimise StuckCiJobsWorker

Closes gitlab-com/infrastructure#3260

See merge request gitlab-org/gitlab-ce!15527

(cherry picked from commit 420cdc6a)

a26e25ea Optimise StuckCiJobsWorker
d58bab4a Use not-ordered search
07c7ba1b Allow to drop jobs for deleted projects
6c1a4294 Fix stuck jobs tests