Flaky-test: TopicsConsumerImplTest.testSyncProducerAndConsumer

[JooHyukKim]

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• I searched in the issues and found nothing similar.

Example failure

https://github.com/apache/pulsar/actions/runs/5320450216/jobs/9634552632#step:10:1830

Exception stacktrace

  Error:  org.apache.pulsar.client.impl.TopicsConsumerImplTest.testSyncProducerAndConsumer  Time elapsed: 0 s  <<< FAILURE!
  java.lang.NullPointerException: Cannot invoke "org.apache.pulsar.client.admin.PulsarAdmin.clusters()" because "this.admin" is null
  	at org.apache.pulsar.broker.auth.MockedPulsarServiceBaseTest.createDefaultTenantInfo(MockedPulsarServiceBaseTest.java:426)
  	at org.apache.pulsar.client.impl.TopicsConsumerImplTest.testSyncProducerAndConsumer(TopicsConsumerImplTest.java:242)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
  	at org.testng.internal.invokers.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:47)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:76)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  	at java.base/java.lang.Thread.run(Thread.java:833)

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• I'm willing to submit a PR!

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