fix(tracing): avoid mutating caller exception in CompositeTracer operationFailed

Author: jinseopkim0

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/CompositeTracer.java

@@ -129,9 +129,7 @@ public void operationFailed(Throwable error) {
     try {
       scope = inScope();
     } catch (RuntimeException e) {
-      if (error != null && error != e) {
-        error.addSuppressed(e);
-      }
+      // Ignore to prevent disrupting the lifecycle notification
     }
     try (Scope s = scope) {
       for (int i = children.size() - 1; i >= 0; i--) {