Flaky-test: SchemaTest.testDeleteTopicAndSchemaForV1

### 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/7778849865?check_suite_focus=true

### Exception stacktrace

```
Error: Tests run: 56, Failures: 1, Errors: 0, Skipped: 51, Time elapsed: 87.642 s <<< FAILURE! - in org.apache.pulsar.schema.SchemaTest
Error: testDeleteTopicAndSchemaForV1(org.apache.pulsar.schema.SchemaTest) Time elapsed: 0.289 s <<< FAILURE!
java.lang.AssertionError: expected [true] but found [false]
at org.testng.Assert.fail(Assert.java:99)
at org.testng.Assert.failNotEquals(Assert.java:1037)
at org.testng.Assert.assertTrue(Assert.java:45)
at org.testng.Assert.assertTrue(Assert.java:55)
at org.apache.pulsar.schema.SchemaTest.testDeleteTopicAndSchemaForV1(SchemaTest.java:845)
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.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.schema.SchemaTest.testDeleteTopicAndSchemaForV1 at SchemaTest.java:845 and inspect the linked CI failure. Reproduce the failure and determine why the assertion intermittently returns false. Done means the test reliably passes without masking the underlying check.

Written by the indexing model from the issue text.