vda5050_controller: create error entry in state if action fails

[alyquantillion]

Changes made:

• When an action is finished, the action_states.result_description field of the order state is updated
• When an action is failed, an error entry in the order state is created

These two behaviors are described in the VDA5050 standard (json schemas and section 6.10.6 in the actionStates description)

---

Note

Records result_description when actions finish and publishes a state error entry when an action fails.

• Controller (vda5050_controller.py):
  • Action state updates:
    • Extend _update_action_status(action_id, action_status, result_description=""); when status is FINISHED, set action_state.result_description.
    • Pass through result_description from adapter in _get_state_from_adapter_callback and _process_vda_action_result_callback.
  • Error handling:
    • Add ActionErrors.ACTION_FAILED.
    • On VDACurrentAction.FAILED, append a VDAError with error_type="actionFailed", error_description from result_description, level FATAL, and an action_id reference; publish then clear.

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[cursor]

Bug: Action Object Missing Expected Attribute

The code attempts to access action.result_description where action is of type VDAAction, but result_description is only a field on VDACurrentAction, not VDAAction. This will cause an AttributeError when the stateRequest instant action is processed. The result_description for stateRequest actions should likely be an empty string or a constant value since it's a built-in action type.