Relax configuration requirements when starting DatabaseAsyncResolver from KQP (#2683)

Author: vitalyisaev2

ydb/core/kqp/federated_query/kqp_federated_query_helpers.cpp

@@ -120,10 +120,8 @@ namespace NKikimr::NKqp {
             YtGateway};
 
         // Init DatabaseAsyncResolver only if all requirements are met
-        if (DatabaseResolverActorId && 
-            GenericGatewaysConfig.HasMdbGateway() && 
-            GenericGatewaysConfig.HasYdbMvpEndpoint() && 
-            MdbEndpointGenerator) {
+        if (DatabaseResolverActorId && MdbEndpointGenerator &&
+            (GenericGatewaysConfig.HasMdbGateway() || GenericGatewaysConfig.HasYdbMvpEndpoint())) {
             result.DatabaseAsyncResolver = std::make_shared<NFq::TDatabaseAsyncResolverImpl>(
                 actorSystem,
                 DatabaseResolverActorId.value(),