include job shard in process name for worker

test plan:
 * run delayed jobs
 * using `ps aux | grep delay` confirm that the worker's
   shard id is included in the wait (likely 1)
 * in console, do `Kernel.send_later(:sleep, 60)`
 * using `ps aux | grep delay` confirm that the job's
   shard id is included (likely 1)

Change-Id: I4ef23c5fba72ae72441ba40e5890d5678a8223c3
Reviewed-on: https://gerrit.instructure.com/40210
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>