Use new Heartbeat setup in check_celery instead of check_heartbeat
Use new Heartbeat setup in check_celery instead of check_heartbeat

the celery check is the one that has currently been giving us problems
and that we want to replace with something better, which I think is this.
I think eventually we plan to remove the separate heartbeat check.

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq