Change Otel::new() to not require async block

Currently in MQ, `Otel::new()` needs to be run in an async block that's regulated by a `std::sync::mspc::channel()` (Sender/Receiver) to allow the creation of an otel component to finish before logging that the broker replica has started running.

It would make more sense for this to be totally synchronous as it is a `new()` function. @danewalton-msft, do you think it would be possible to refactor this?