eager initialization of CoordinatedShutdown, #22191

* e.g. the jvm shutdown hook should be installed immediately
* noticed that it was initialized from artery shutdown
* run-by-jvm-shutdown-hook=off in multi-jvm tests

akka-multi-node-testkit/src/main/scala/akka/remote/testkit/MultiNodeSpec.scala

@@ -214,6 +214,7 @@ object MultiNodeSpec {
         loggers = ["akka.testkit.TestEventListener"]
         loglevel = "WARNING"
         stdout-loglevel = "WARNING"
+        coordinated-shutdown.run-by-jvm-shutdown-hook = off
         actor {
           default-dispatcher {
             executor = "fork-join-executor"