fix: record error attributes on attempt span when operation fails

Author: jinseopkim0

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

@@ -212,7 +212,7 @@ public void operationFailed(Throwable error) {
 
   private void recordErrorAndEndOperation(@Nullable Throwable error) {
     if (attemptSpan != null) {
-      endAttempt();
+      recordErrorAndEndAttempt(error);
     }
     if (operationSpan == null) {
       return;

sdk-platform-java/gax-java/gax/src/test/java/com/google/api/gax/tracing/OpenTelemetryTracingTracerTest.java

@@ -832,6 +832,7 @@ void testOperationFailed_endsActiveAttemptSpan() {
     openTelemetryTracingTracer.attemptStarted(new Object(), 1);
     openTelemetryTracingTracer.operationFailed(new RuntimeException("operation failed"));
 
+    verify(span).setAttribute(ObservabilityAttributes.STATUS_MESSAGE_ATTRIBUTE, "operation failed");
     verify(span).end();
     verify(operationSpan).end();
   }