New feature flags for Fan platform

[make-all]

In HA 2024.8, new flags are being introduced for FanEntityFeature.TURN_ON and TURN_OFF.

As with the climate platform when these were introduced there, there is an ugly hack of setting an internal attribute when the change has been made to avoid poorly implemented warnings.

https://developers.home-assistant.io/blog/2024/07/19/fan-fanentityfeatures-turn-on_off

[zaubara]

Amazing, thank you!
Unfortunately turning it off doesn't work without issue; its always displayed at 20% (even when off), and using the fan switch reports that the action fan/turn_off couldn't be run and is not supported by the device. Maybe another issue with #2243?

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py", line 245, in handle_call_service
response = await hass.services.async_call(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/core.py", line 2761, in async_call
response_data = await coro
^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/core.py", line 2804, in _execute_service
return await target(service_call)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 978, in entity_service_call
raise HomeAssistantError(
homeassistant.exceptions.HomeAssistantError: Entity fan.dunstabzug does not support this service.

[make-all]

Are you perhaps using a fan which does not support turning on/off?

[zaubara]

It's controlled with the speed settings 1 through 4, and 0 turns it off (in addition to the main off switch). That is "supporting it", I think?
Maybe there needs to be a mapping to speed 0 being the "turn off" function? It worked on the older HA / plugin version, unfortunately I'm not sure when exactly it stopped working.
Sorry, I meant to post this in #2258.