Flaky-tests: misc tests failing with java.lang.NoClassDefFoundError: Could not initialize class org.apache.pulsar.common.protocol.Commands

### 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/7884887469?check_suite_focus=true

### Exception stacktrace

```
java.lang.NoClassDefFoundError: Could not initialize class org.apache.pulsar.common.protocol.Commands
at org.apache.pulsar.client.impl.ClientCnx.(ClientCnx.java:220)
at org.apache.pulsar.client.impl.ClientCnxRequestTimeoutQueueTest.setupClientCnx(ClientCnxRequestTimeoutQueueTest.java:63)
```

### Are you willing to submit a PR?

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

Start with the linked GitHub Actions run and ClientCnxRequestTimeoutQueueTest.setupClientCnx at line 63, then inspect the Commands class initialization implicated by the stack trace. Reproduce the failure in the misc tests and identify why initialization is flaky; done means the affected tests run reliably without this NoClassDefFoundError.

Written by the indexing model from the issue text.