When deleting process instances, I can configure whether this propagates to (child) process instances.
- a flag can be set when using RuntimeService#deleteProcessInstance(), #deleteProcessInstances(), and #deleteProcessInstancesAsync() to configure the propagation
- it is exposed in the REST API
We should think about what happens with the process instance in the history (i.e. with HistoricProcessInstance#SUPER_PROCESS_INSTANCE_ID_).