feat: run celery without mingle, heartbeat, or gossip (#68)

Attempt to resolve https://2u-internal.atlassian.net/wiki/spaces/ENG/pages/1325236431/RCA+Sept+2024+edX+Celery+Queuing+issue by removing (hopefully) unnecessary
traffic and log messages.

playbooks/roles/edxapp/templates/edx/app/supervisor/conf.d.available/workers.conf.j2

@@ -7,7 +7,7 @@ directory={{ edxapp_code_dir }}
 stdout_logfile={{ supervisor_log_dir }}/%(program_name)s-stdout.log
 stderr_logfile={{ supervisor_log_dir }}/%(program_name)s-stderr.log
 
-command={{ edxapp_app_dir }}/worker.sh --app={{ w.service_variant }}.celery:APP worker --loglevel=info --queues=edx.{{ w.service_variant }}.core.{{ w.queue }} --hostname=edx.{{ w.service_variant }}.core.{{ w.queue }}.%%h --concurrency={{ w.concurrency }} {{ '--max-tasks-per-child ' + w.max_tasks_per_child|string if w.max_tasks_per_child is defined else '' }} {{ '--without-heartbeat' if not EDXAPP_CELERY_HEARTBEAT_ENABLED|bool else '' }} {{ '-O ' + w.prefetch_optimization if w.prefetch_optimization is defined else '' }}
+command={{ edxapp_app_dir }}/worker.sh --app={{ w.service_variant }}.celery:APP worker --loglevel=info --queues=edx.{{ w.service_variant }}.core.{{ w.queue }} --hostname=edx.{{ w.service_variant }}.core.{{ w.queue }}.%%h --concurrency={{ w.concurrency }} {{ '--max-tasks-per-child ' + w.max_tasks_per_child|string if w.max_tasks_per_child is defined else '' }}  --without-heartbeat --without-gossip --without-mingle {{ '-O ' + w.prefetch_optimization if w.prefetch_optimization is defined else '' }}
 killasgroup=true
 stopwaitsecs={{ w.stopwaitsecs | default(EDXAPP_WORKER_DEFAULT_STOPWAITSECS) }}