fix(test): unobfuscate via actual class to support ObfuscatedExtendedOpenTelemetry

Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdkTest.java

@@ -757,13 +757,11 @@ void globalOpenTelemetryLock() throws InterruptedException, ExecutionException,
 
   private static OpenTelemetry unobfuscate(OpenTelemetry openTelemetry) {
     try {
-      Field delegateField =
-          Class.forName("io.opentelemetry.api.GlobalOpenTelemetry$ObfuscatedOpenTelemetry")
-              .getDeclaredField("delegate");
+      Field delegateField = openTelemetry.getClass().getDeclaredField("delegate");
       delegateField.setAccessible(true);
       Object delegate = delegateField.get(openTelemetry);
       return (OpenTelemetry) delegate;
-    } catch (NoSuchFieldException | IllegalAccessException | ClassNotFoundException e) {
+    } catch (NoSuchFieldException | IllegalAccessException e) {
       throw new IllegalStateException("Error unobfuscating OpenTelemetry", e);
     }
   }