KIOSK: Hide if similar exists

A new field has been added in the product configuration: Hide if similar exists. This can be used in the kiosk for available services. For example, if a hotel offers three types of breakfast and a guest has already booked one, you may choose not to display the other breakfast options in the kiosk. By configuring this field, you can select which products should  hidden if a specific product is already booked.

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