Restore upload_graph hasExperiment guard to prevent duplicate log message

Author: ash6898

runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowRunner.java

@@ -1526,7 +1526,8 @@ public DataflowPipelineJob run(Pipeline pipeline) {
     // enable upload_graph when the graph is too large
     byte[] jobGraphBytes = DataflowPipelineTranslator.jobToString(newJob).getBytes(UTF_8);
     int jobGraphByteSize = jobGraphBytes.length;
-    if (jobGraphByteSize >= CREATE_JOB_REQUEST_LIMIT_BYTES && !useUnifiedWorker(options)) {
+    if (jobGraphByteSize >= CREATE_JOB_REQUEST_LIMIT_BYTES && !useUnifiedWorker(options)
+        && !hasExperiment(options, "upload_graph")) {
       ExperimentalOptions.addExperiment(options, "upload_graph");
       LOG.info(
           "The job graph size ({} in bytes) is larger than {}. Automatically add "