GraalVM nightly failures for Dialog Flow

[zhumin8]

This error seems to be flaky, but getting pretty frequent lately together with #11377 in the last couple of days

https://screenshot.googleplex.com/BqfWxYx5prJnhKS

Failures (2):
  JUnit Vintage:ITSystemTest:detectIntentTest
    MethodSource [className = 'com.google.cloud.dialogflow.v2.it.ITSystemTest', methodName = 'detectIntentTest', methodParameterTypes = '']
    => org.junit.ComparisonFailure: expected:<[test-event-5aa666db-72b1-475e-9b9d-63d1ac4f682a]> but was:<[]>
       org.junit.Assert.assertEquals(Assert.java:117)
       org.junit.Assert.assertEquals(Assert.java:146)
       com.google.cloud.dialogflow.v2.it.ITSystemTest.detectIntentTest(ITSystemTest.java:282)
       [email protected]/java.lang.reflect.Method.invoke([Method.java:580](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=java/lang/reflect/Method.java:580))
  JUnit Vintage:ITSystemTest:listContextsTest
    MethodSource [className = 'com.google.cloud.dialogflow.v2.it.ITSystemTest', methodName = 'listContextsTest', methodParameterTypes = '']
    => org.junit.ComparisonFailure: expected:<...1b11a9a646/contexts/[test-context-8348c918]> but was:<...1b11a9a646/contexts/[__system_counters__]>
       org.junit.Assert.assertEquals(Assert.java:117)
       org.junit.Assert.assertEquals(Assert.java:146)
       com.google.cloud.dialogflow.v2.it.ITSystemTest.listContextsTest(ITSystemTest.java:293)
       [email protected]/java.lang.reflect.Method.invoke([Method.java:580](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=java/lang/reflect/Method.java:580))