fix!: Remove deprecated Home Assistant integration features

[Koenkk]

• Docs Remove deprecated Home Assistant integration features zigbee2mqtt.io#3143
• ZHC: fix!: Cleanup child_lock zigbee-herdsman-converters#8219

For #24198:

• Remove deprecated Home Assistant integration features:
  • Action and click sensors have been removed (homeassistant.legacy_triggers setting). This means all sensor.*_action and sensor.*_click entities are removed. Use the MQTT device trigger instead.
  • Entity attributes (homeassistant.legacy_entity_attributes setting) has been removed. This means that entities discovered by Zigbee2MQTT will no longer have entity attributes (Home Assistant entity attributes are accessed via e.g. states.binary_sensor.my_sensor.attributes).
  • All child lock entities are now discovered as a switch instead of lock
  • External converters can no longer expose entities to Home Assistant via the homeassistant property, use exposes instead
  • The update_state and update_available entities have been removed (succeeded by the update entities)

Per device:

• IKEA ICTC-G-1: the Home Assistant brightness sensor has been removed
• Aqara SRTS-A01: child_lock on/off values have been changed from true/false to LOCK/UNLOCK