Flaky-test: ProducerMemoryLimitTest.testProducerTimeoutMemoryRelease

### Search before asking

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

### Example failures

- [2023-09-25T15:53:07.4467580Z](https://github.com/apache/pulsar/actions/runs/6298840062/job/17107400437#step:10:692)

### Exception stacktrace

```
java.lang.AssertionError: expected [0] but found [11]
at org.testng.Assert.fail(Assert.java:110)
at org.testng.Assert.failNotEquals(Assert.java:1577)
at org.testng.Assert.assertEqualsImpl(Assert.java:149)
at org.testng.Assert.assertEquals(Assert.java:131)
at org.testng.Assert.assertEquals(Assert.java:979)
at org.testng.Assert.assertEquals(Assert.java:955)
at org.testng.Assert.assertEquals(Assert.java:989)
at org.apache.pulsar.client.impl.ProducerMemoryLimitTest.testProducerTimeoutMemoryRelease(ProducerMemoryLimitTest.java:99)
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)

```

### Are you willing to submit a PR?

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

Open ProducerMemoryLimitTest.java at testProducerTimeoutMemoryRelease, where line 99 asserts that the released count is 0 but observed 11. Reproduce the flaky failure and inspect the producer timeout and memory-release behavior; done means the test reliably passes with the expected count.

Written by the indexing model from the issue text.