[Sharding.Delivery] Stopped consumer causes ShardingConsumerControllerImpl to shutdown uncleanly

[Arkatufus]

Version Information
Version of Akka.NET? dev
Which Akka.NET Modules? Akka.Cluster.Sharding.Delivery

Describe the bug

When a cluster sharding delivery entity is stopped (by passivation or other means), the ShardingConsumerControllerImpl immediately stops itself without waiting for its other deathwatched children (ProducerController and ConsumerController) to shut down, causing all deathwatch messages to be sent to deadletter. There might be other side effect, such as ProducerController that didn't shut down properly, leaving dangling ConsumerController somewhere in the cluster. <-- not proven