Fix: increase stability of integration tests

### Is there an existing proposal for this?

- [x] I have searched the existing proposals

### Is your feature request related to a problem?

Commonly failing tests:
```
BrokerSessionIT.closeQueueOnPendingConfigureRequest:2890 expected: but was:
BrokerSessionIT.inboundWatermarksTest:5621->verifyQueueControlEvent:187 Expected 'QueueControlEvent', received 'com.bloomberg.bmq.impl.events.BrokerSessionEvent'
SessionIT.testQueueFlushDown:3566 Runtime com.bloomberg.bmq.BMQException: Failed to start session: TIMEOUT
```

### Describe the solution you'd like

Check timeouts, check multithreaded problems

### Alternatives you considered

_No response_