fix(types,utils,promotion): Move from total to original_total to resolve edge case for adjustments calculation (#13106)

* Move from total to original_total to resolve edge case in adjustment calculation

* Added changeset

* Added test case for correction

---------

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

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

@@ -110,7 +110,7 @@ function applyPromotionToItems(
         MathBN.sub(
           MathBN.add(
             acc,
-            promotion.is_tax_inclusive ? item.total : item.subtotal
+            promotion.is_tax_inclusive ? item.original_total : item.subtotal
           ),
           appliedPromotionsMap.get(item.id) ?? 0
         ),
@@ -124,7 +124,10 @@ function applyPromotionToItems(
 
   for (const item of applicableItems) {
     if (
-      MathBN.lte(promotion.is_tax_inclusive ? item.total : item.subtotal, 0)
+      MathBN.lte(
+        promotion.is_tax_inclusive ? item.original_total : item.subtotal,
+        0
+      )
     ) {
       continue
     }