Connect giftcards with customer accounts (#5126)

Connect giftcards with customer accounts, show giftcards during checkout and in account , show giftcard list in backend customer view

src/pretix/control/views/orders.py

@@ -1221,6 +1221,7 @@ class OrderRefundView(OrderView):
                 giftcard = self.request.organizer.issued_gift_cards.create(
                     expires=expires,
                     currency=self.request.event.currency,
+                    customer=order.customer,
                     testmode=order.testmode
                 )
                 giftcard.log_action('pretix.giftcards.created', user=self.request.user, data={})

src/pretix/control/views/organizer.py

@@ -3085,6 +3085,8 @@ class CustomerDetailView(OrganizerDetailViewMixin, OrganizerPermissionRequiredMi
             .annotate(spending=Sum("total"))
         )
 
+        ctx["gift_cards"] = self.customer.customer_gift_cards.all()
+
         return ctx