[mqtt.homeassistant] Fix binding crash when home assistant discovery topics update...

[mqtt.homeassistant] Fix binding crash when home assistant discovery topics update with content (#13518)

* [mqtt.homeassistant] Fix for discovery topics that update with content

Fixes #13517
Possibly resolves #9711 and #12295 as well.

* [mqtt.homeassistant] Sort channels before changing thing
* [mqtt.homeassistant] logging + removed unnecessary synchronization
* Resolve bunch of warnings in homeassistant bundle
* [mqtt.homeassistant] Handling null warnings and unnecessary null checks
* [mqtt.homeassistant] Removing unnecessary null checks

Signed-off-by: Sami Salonen <ssalonen@gmail.com>
Co-Authored-by: @antroids github handle