Flaky-test: ManagedCursorTest.testSkipEntriesWithIndividualDeletedMessages

### 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/actions/runs/14792211267/job/41532043148?pr=24236#step:11:2954

### Exception stacktrace

```
Error: Tests run: 166, Failures: 1, Errors: 0, Skipped: 19, Time elapsed: 45.678 s <<< FAILURE! - in org.apache.bookkeeper.mledger.impl.ManagedCursorTest
Error: org.apache.bookkeeper.mledger.impl.ManagedCursorTest.testSkipEntriesWithIndividualDeletedMessages[false](6) Time elapsed: 0.026 s <<< FAILURE!
java.lang.AssertionError: expected [4:0] but found [5:0]
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:643)
at org.apache.bookkeeper.mledger.impl.ManagedCursorTest.testSkipEntriesWithIndividualDeletedMessages(ManagedCursorTest.java:1852)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
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:317)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
```

### Are you willing to submit a PR?

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

Start with org.apache.bookkeeper.mledger.impl.ManagedCursorTest.testSkipEntriesWithIndividualDeletedMessages at ManagedCursorTest.java:1852 and run the test to reproduce the failure. Compare the expected 4:0 with the observed 5:0, trace the skipped-entry behavior, and confirm the test is stable and passing before considering the issue done.

Written by the indexing model from the issue text.