* chore: Update WallboxEntity model ID to use CHARGER_PART_NUMBER_KEY
The WallboxEntity model ID is updated to use the CHARGER_PART_NUMBER_KEY value from the coordinator data. This change ensures consistency and accuracy in identifying the model of the Wallbox entity.
* Update WallboxEntity model ID to use CHARGER_PART_NUMBER_KEY
* chore: Update WallboxEntity model ID to use CHARGER_PART_NUMBER_KEY
* remove obsolete key from test