Flaky-test: V1_ProxyAuthenticationTest.anonymousSocketTest

### 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/3184651648/jobs/5193461550#step:10:1372

### Exception stacktrace

```
Error: Tests run: 16, Failures: 1, Errors: 0, Skipped: 15, Time elapsed: 64.371 s <<< FAILURE! - in org.apache.pulsar.websocket.proxy.v1.V1_ProxyAuthenticationTest
Error: anonymousSocketTest(org.apache.pulsar.websocket.proxy.v1.V1_ProxyAuthenticationTest) Time elapsed: 2.403 s <<< FAILURE!
java.lang.AssertionError: lists don't have the same size expected [5] but found [10]
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:1089)
at org.testng.Assert.assertEquals(Assert.java:1065)
at org.apache.pulsar.websocket.proxy.v1.V1_ProxyAuthenticationTest.socketTest(V1_ProxyAuthenticationTest.java:149)
at org.apache.pulsar.websocket.proxy.v1.V1_ProxyAuthenticationTest.anonymousSocketTest(V1_ProxyAuthenticationTest.java:159)
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?

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

Start with V1_ProxyAuthenticationTest.anonymousSocketTest and the shared socketTest assertion at lines 149 and 159. Run the test repeatedly and inspect the failure showing an expected list size of 5 but an observed size of 10. Done means the flaky test no longer fails intermittently while preserving the intended authentication behavior.

Written by the indexing model from the issue text.