Fix PublishWithAck response message type

Author: Arkatufus

src/contrib/cluster/Akka.Cluster.Tools/PublishSubscribe/DistributedMessages.cs

@@ -441,9 +441,11 @@ public enum PublishFailReason
         MediatorShuttingDown
     }
 
-    public sealed record PublishFailed(PublishWithAck Message, PublishFailReason Reason): IDeadLetterSuppression;
+    public interface IPublishResponse;
 
-    public sealed record PublishSucceeded(PublishWithAck Message): IDeadLetterSuppression;
+    public sealed record PublishFailed(PublishWithAck Message, PublishFailReason Reason): IPublishResponse, IDeadLetterSuppression;
+    
+    public sealed record PublishSucceeded(PublishWithAck Message): IPublishResponse, IDeadLetterSuppression;
 
     /// <summary>
     /// TBD