Ensure RetryAcknowledgementBehavior gets triggered

RetryAcknowledgementBehavior in NSB core expects a value in both "ServiceControl.Retry.UniqueMessageId" and "ServiceControl.Retry.AcknowledgementQueue" headers in order to dispatch a OutgoingMessage confirming the successful retry

Author: Christian

src/ServiceControl/Recoverability/Editing/EditHandler.cs

@@ -71,6 +71,7 @@ public async Task Handle(EditAndSend message, IMessageHandlerContext context)
             // mark the new message with a link to the original message id
             outgoingMessage.Headers.Add("ServiceControl.EditOf", message.FailedMessageId);
             outgoingMessage.Headers["ServiceControl.Retry.AcknowledgementQueue"] = errorQueueNameCache.ResolvedErrorAddress;
+            outgoingMessage.Headers["ServiceControl.Retry.UniqueMessageId"] = Guid.NewGuid().ToString("D");
 
             var address = ApplyRedirect(attempt.FailureDetails.AddressOfFailingEndpoint, redirects);