Add named exception to detect when a cluster node has been quarantined by others #18758

Publish appropriate events to the current ActorSystem event stream upon remote ActorSystem shutdown or when current ActorSystem is quarantined by the remote ActorSystem.

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteRestartedQuarantinedSpec.scala

@@ -100,6 +100,7 @@ abstract class RemoteRestartedQuarantinedSpec
       runOn(second) {
         val addr = system.asInstanceOf[ExtendedActorSystem].provider.getDefaultAddress
         val firstAddress = node(first).address
+        system.eventStream.subscribe(testActor, classOf[ThisActorSystemQuarantinedEvent])
 
         val (_, ref) = identifyWithUid(first, "subject")
 
@@ -114,6 +115,10 @@ abstract class RemoteRestartedQuarantinedSpec
           }
         }
 
+        expectMsgPF(10 seconds) {
+          case ThisActorSystemQuarantinedEvent(local, remote) ⇒
+        }
+
         enterBarrier("still-quarantined")
 
         system.awaitTermination(10.seconds)