[ML] Changes to calendars or filters do not update autodetect if handled on non-master node

[dimitris-athanasiou]

In a multi-node cluster, any changes to calendars or filters used by a running job will not update the autodetect process if the corresponding actions are run on a non-master node.

The reason for this is because those updates are submitted to the UpdateJobProcessNotifier which is only running on the master node. So, even though it exists on non-master nodes, it's not running and the updates fall through.

[elasticmachine]

Pinging @elastic/ml-core