Fixes: https://github.com/spring-projects/spring-integration/issues/9854
The well-known `Dispatcher has no subscribers` is not very informative
when a message is produced from early application context initialization phase
* Add internal `ApplicationRunningController` bean to handle early `start()` event
* Check for this bean status from the `AbstractMessageChannel.send()`
* Throw specific `MessageDispatchingException` to indicate that the message was produced from a wrong place
* Adjust `ApplicationEventListeningMessageProducer` logic for `ContextStoppedEvent` & `ContextClosedEvent`
to indicate that `AbstractMessageChannel` bean might not dispatch a message because the application context is not running
2296e4798e