OZG-6638 extend logging

vorgang-manager-server/src/main/java/de/ozgcloud/vorgang/registry/ZufiRemoteService.java

@@ -21,8 +21,12 @@ class ZufiRemoteService {
 	private VorgangManagerRegistrationServiceBlockingStub serviceStub;
 
 	public void registerVorgangManager(@NonNull List<String> organistationsEinheitenIds, String vorgangManagerAddress) {
-		boolean success = getServiceStub().register(buildRequest(organistationsEinheitenIds, vorgangManagerAddress)).getSuccess();
-		LOG.info("Register success: {}", success);
+		var result = getServiceStub().register(buildRequest(organistationsEinheitenIds, vorgangManagerAddress));
+		if (result.getSuccess()) {
+			LOG.info("Registration successfully organisationIds: {}", organistationsEinheitenIds);
+		} else {
+			LOG.error("Registration failed: {}", result.getMessage());
+		}
 	}
 
 	private VorgangManagerRegistrationServiceBlockingStub getServiceStub() {