Orders the dashboard items based on the provided order.

This endpoint is accessible only to users with System or Admin roles.

Calls made by Employee users will result in a Forbidden response, even if they belong to the same company.

Checks role access and validates employee IDs before processing the order.
It updates the order and visibility of dashboard items, removes old items from the database, and creates new ones.
Additionally, it notifies webhooks about the updated dashboard order.