Add monitoring for Minion job queue on every worker
We already have monitoring for the job queue on the webui side. On the worker side we have the exact same job queue, but without the monitoring. Since a telegraf instance runs on every worker already, it should be pretty easy to duplicate the
/admin/influxdb/minion route to the Cache Service HTTP server. We just might have to activate preforking to make sure the service is always responsive, but that's not a problem either since the latest refactoring.