fix(telemetry): slow the Job Queue dashboard refresh to 30s

Every other dashboard refreshes at 30s. This one was at 5s, which re-ran all
of its queries twelve times a minute for no benefit.

docker/telemetry/grafana/dashboards/job-queue.json

@@ -804,5 +804,5 @@
   "title": "Job Queue Analysis",
   "uid": "job-queue",
   "version": 1,
-  "refresh": "5s"
+  "refresh": "30s"
 }