Flaky-test: ConsumerBatchReceiveTest.testBatchReceiveAndRedeliveryNonPartitionedTopic

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Example failure

https://github.com/apache/pulsar/runs/8306845946?check_suite_focus=true#step:10:1324

### Exception stacktrace

Full exception stacktrace

  Error:  Tests run: 204, Failures: 7, Errors: 0, Skipped: 83, Time elapsed: 241.006 s <<< FAILURE! - in org.apache.pulsar.client.api.ConsumerBatchReceiveTest

  Error:  testBatchReceiveAndRedeliveryNonPartitionedTopic(org.apache.pulsar.client.api.ConsumerBatchReceiveTest)  Time elapsed: 4.618 s  <<< FAILURE!

  java.lang.AssertionError: expected [202] but found [200]

  	at org.testng.Assert.fail(Assert.java:99)

  	at org.testng.Assert.failNotEquals(Assert.java:1037)

  	at org.testng.Assert.assertEqualsImpl(Assert.java:140)

  	at org.testng.Assert.assertEquals(Assert.java:122)

  	at org.testng.Assert.assertEquals(Assert.java:907)

  	at org.testng.Assert.assertEquals(Assert.java:917)

  	at org.apache.pulsar.client.api.ConsumerBatchReceiveTest.batchReceiveAndRedelivery(ConsumerBatchReceiveTest.java:648)

  	at org.apache.pulsar.client.api.ConsumerBatchReceiveTest.testBatchReceiveAndRedelivery(ConsumerBatchReceiveTest.java:564)

  	at org.apache.pulsar.client.api.ConsumerBatchReceiveTest.testBatchReceiveAndRedeliveryNonPartitionedTopic(ConsumerBatchReceiveTest.java:382)

  	at jdk.internal.reflect.GeneratedMethodAccessor714.invoke(Unknown Source)

  	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.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)

  	at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)

  	at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)

  	at org.testng.internal.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)

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with org.apache.pulsar.client.api.ConsumerBatchReceiveTest, especially testBatchReceiveAndRedeliveryNonPartitionedTopic and batchReceiveAndRedelivery around lines 382, 564, and 648. Run the targeted test repeatedly and investigate why the redelivery assertion sometimes finds 200 messages instead of 202. Done means the test reliably passes while still checking batch receive and redelivery behavior.

Written by the indexing model from the issue text.