Avoid warning of unhandled message (backport #9884) #9885
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Prior to this commit:
1. Start RabbitMQ with MQTT plugin enabled.
2.
```
rabbitmq-diagnostics consume_event_stream
^C
```
3. The logs will print the following warning:
```
[warning] <0.570.0> ** Undefined handle_info in rabbit_mqtt_internal_event_handler
[warning] <0.570.0> ** Unhandled message: {'DOWN',#Ref<0.2410135134.1846280193.145044>,process,
[warning] <0.570.0> <52723.100.0>,noconnection}
[warning] <0.570.0>
```
This is because rabbit_event_consumer:init/1 monitors the CLI process.
Any rabbit_event handler should therefore implement handle_info/2.
It's similar to what's described in the gen_event docs about
add_sup_handler/3:
> Any event handler attached to an event manager which in turn has a
> supervised handler should expect callbacks of the shape
> Module:handle_info({'EXIT', Pid, Reason}, State).
(cherry picked from commit 5b18e9d)
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This is an automatic backport of pull request #9884 done by Mergify.
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