workflow tasks should not be serialized as part of works

The routing security updater (org.nuxeo.ecm.platform.routing.core.listener.RoutingTaskSecurityUpdaterListener) should not transmit a reference to a document model in the event context but instead a reference to the document.

org.nuxeo.ecm.platform.routing.core.listener.RoutingTaskSecurityUpdaterListener.handleEvent(Event)
org.nuxeo.ecm.platform.task.core.service.TaskEventNotificationHelper.notifyEvent