message: Use ClusterInfo from streaminfo to get clustername too
  Remove files
diff: @@ -516,6 +516,9 @@ Context::FindValue(absl::string_view name, Protobuf::Arena* arena) const {
  return CelValue::CreateString(&info->upstreamHost()->cluster().name());
  } else if (info && info->routeEntry()) {
  return CelValue::CreateString(&info->routeEntry()->clusterName());
  + } else if (info && info->upstreamClusterInfo().has_value() &&
  + info->upstreamClusterInfo().value()) {
  + return CelValue::CreateString(&info->upstreamClusterInfo().value()->name());
  }
  break;
  case PropertyToken::CLUSTER_METADATA:
  