[OpenTelemetry] Turn off gcp otel auth extension by default. (#38940)

* turn off gcp otel auth extension by default.

Author: stankiewicz

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

@@ -1061,6 +1061,12 @@ public static void main(String[] args) throws Exception {
             }
           });
       LOG.info("Enabled Open Telemetry with properties: {}", openTelemetryProperties);
+    } else {
+      // turn off auth extension so it doesn't interfere if user is configuring otel e.g. via
+      // JvmInitializer.
+      if (System.getProperty("google.otel.auth.target.signals") == null) {
+        System.setProperty("google.otel.auth.target.signals", "none");
+      }
     }
 
     LOG.debug("Creating StreamingDataflowWorker from options: {}", options);

sdks/java/harness/src/main/java/org/apache/beam/fn/harness/FnHarness.java

@@ -315,6 +315,12 @@ public static void main(
               }
             });
         LOG.info("Enabled Open Telemetry with properties: {}", openTelemetryProperties);
+      } else {
+        // turn off auth extension so it doesn't interfere if user is configuring otel e.g. via
+        // JvmInitializer.
+        if (System.getProperty("google.otel.auth.target.signals") == null) {
+          System.setProperty("google.otel.auth.target.signals", "none");
+        }
       }
       EnumMap<
               BeamFnApi.InstructionRequest.RequestCase,