shop: cart: Added cart line promotions info (as shown in order review/complete)
shop: cart: Added cart line promotions info (as shown in order review/complete)

Refs https://gitlab.ilscipio.com/scipio-dev/dev/scipioce-dev/issues/484

ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp