|#1386| +Riya| adding alter scripts for replacedProductCode in shipment_line_items, dropping unique constraint orderId and productCode
|#1386| +Riya| Adding replacedProductCode in ShipmentLineItem and ShipmentLineItemDTO. Validating the field for valid productCode.
|#1386| +Riya| saving replacedProductCode in db. Removing unused getLineItem, updateLineItem API from mapper, repository.
|#1386| +Riya| checking replacedProductCode to be a valid product in both cases if it is in rnr or substitute product.