Ozg 7573 forwarding interface

vorgang-manager-server/src/main/java/de/ozgcloud/vorgang/vorgang/redirect/ForwardingRemoteService.java

@@ -46,7 +46,7 @@ class ForwardingRemoteService {
 	private final VorgangService vorgangService;
 	private final ForwardingRequestMapper forwardingRequestMapper;
 	@GrpcClient("forwarder")
-	private final RouteForwardingServiceGrpc.RouteForwardingServiceStub routeForwardingServiceGrpc;
+	private final RouteForwardingServiceGrpc.RouteForwardingServiceStub serviceStub;
 
 	public void forward(ForwardingRequest request) {
 		CompletableFuture<Void> responseFuture = new CompletableFuture<>();
@@ -55,13 +55,14 @@ class ForwardingRemoteService {
 	}
 
 	void routeForwarding(ForwardingRequest request, ForwardingResponseObserver responseObserver) {
-		var requestStreamObserver = routeForwardingServiceGrpc.withInterceptors(new VorgangManagerClientCallContextAttachingInterceptor())
+		var requestStreamObserver = serviceStub.withInterceptors(new VorgangManagerClientCallContextAttachingInterceptor())
 				.routeForwarding(responseObserver);
 		try {
 			sendEingang(request, requestStreamObserver);
 			requestStreamObserver.onCompleted();
 		} catch (Throwable t) {
 			requestStreamObserver.onError(t);
+			throw t;
 		}
 	}