feat: Add product and pricing link on create and delete operations (#6740)

Things that remain to be done:
1. Handle product and variant updates
2. Add tests for the workflows independently
3. Align the endpoints to the new code conventions we defined
4. Finish up the update/upsert endpoints for variants

All of those can be done in a separate PR, as this is quite large already.

packages/link-modules/src/definitions/product-variant-price-set.ts

@@ -41,11 +41,14 @@ export const ProductVariantPriceSet: ModuleJoinerConfig = {
   extends: [
     {
       serviceName: Modules.PRODUCT,
+      fieldAlias: {
+        price_set: "price_set_link.price_set",
+      },
       relationship: {
         serviceName: LINKS.ProductVariantPriceSet,
         primaryKey: "variant_id",
         foreignKey: "id",
-        alias: "price",
+        alias: "price_set_link",
       },
     },
     {