CloverJMX has unsuitable synchronization

Our customer run into following synchronization issue.

CloverJMX bean gets information about a job can be released - releaseJob() method. Following method is called to inform other listeners about this event:

	private void sendReleaseWatchdogNotification(WatchDog watchDog) {
		synchronized (jobListeners) {
			for (JobListener jobListener : jobListeners) {
				jobListener.jobFinished(watchDog);
			}
		}
	}

Unfortunatelly one of the listeners is stuck by a DB connection, which swallows a thread on close() method. From now on, all incomming events about job release are blocked on the jobListeners monitor. It is well visible at FastThread report of attached thread dump:

Similar issue has been already noticed in an our internal test:
https://wiki.cloverdx.com/display/DEVELOPMENT/2019-08-22+TES+-+Server+VTE+Stresstest%28s%29+before+release+5-3-1