The `QueueChannel.receive()` may be fulfilled before
an observation is stopped in the `MessageHandler`
* Rework `IntegrationObservabilityZipkinTests` configuration to add
a `HandleMessageAdvice` to wait on the `CountDownLatch` before asserting spans
* Exclude an `adviceChain` attribute from the `ServiceActivatorAnnotationPostProcessor`
since an advice can be applied for the consumer endpoint, not the MH directly.
The `ConsumerEndpointFactoryBean` does the proper decision to apply advice onto MH
or just around its `handleMessage()` method
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