fix(promotion, types): non discountable items check (#12644)

* fix(promotions): check if item is discountable

* fix: return earl yonly if non discountable

* fix: update test

* chore: add integration test

packages/modules/promotion/src/utils/compute-actions/line-items.ts

@@ -201,7 +201,15 @@ function getValidItemsForPromotion(
   }
 
   return items.filter((item) => {
-    if (!item || !("subtotal" in item) || MathBN.lte(item.subtotal, 0)) {
+    if (!item) {
+      return false
+    }
+
+    if ("is_discountable" in item && !item.is_discountable) {
+      return false
+    }
+
+    if (!("subtotal" in item) || MathBN.lte(item.subtotal, 0)) {
       return false
     }