docs: @BetaApi
    public final Operation insertInterconnectAttachment(
        ProjectRegionName region, InterconnectAttachment interconnectAttachmentResource) {
  
      InsertInterconnectAttachmentHttpRequest request =
          InsertInterconnectAttachmentHttpRequest.newBuilder()
              .setRegion(region == null ? null : region.toString())
              .setInterconnectAttachmentResource(interconnectAttachmentResource)
              .build();
      return insertInterconnectAttachment(request);
    }