2014749626 - Improved XML product import functionality

Previously, when importing a product from a supplier, it was created anew by the automatic action “Universal product import (xml/json)”. Now, if, when importing a product, it is linked to some existing one with another supplier, a new position is not created, because it is already associated with the position we need. Also, there is an opportunity: - update the availability and price (Purchase, RRP, currency) of a product that is imported via XML by the code of the supplier of the product (previously only by name, article or external ID) - the search and update of the position will be performed for the goods of the supplier that is linked to the link, then by the code of the goods supplier (if there is a checkmark in the settings of the automatic action Universal XML import "Update availability and prices (Purchase, RRP, currency) by the code of the goods supplier "