Remove aux_heat support from climate

[make-all]

Aux_heat support became hidden when the climate card was updated in Home Assistant a few months ago, and I became aware of a plan to deprecate it then, and deprecated the support in tuya_local. In 2024.4, the deprecation in Home Assistant becomes official, and it has probably been deprecated long enough in tuya-local that it can be removed immediately to avoid superfluous bugs about deprecation notices.

https://developers.home-assistant.io/blog/2024/03/10/climate-aux-heater-deprecated

Only three devices use this: ITS 45HD (replaced by binary_sensor), Sendo (replaced by switch), Vivax (replaced by switch)