fix(medusa): Product model before insert hook (#5200)

**What**
When the id is provided, the rest of the hook should still apply. At the moment, when the id is provided the hook is skipped

integration-tests/api/__tests__/store/products.js

@@ -24,6 +24,7 @@ describe("/store/products", () => {
   const giftCardId = "giftcard"
   const testProductId = "test-product"
   const testProductId1 = "test-product1"
+  const testProductId2 = "test-product2"
   const testProductFilteringId1 = "test-product_filtering_1"
   const testProductFilteringId2 = "test-product_filtering_2"
 
@@ -156,7 +157,7 @@ describe("/store/products", () => {
         response.data.products.find((p) => p.id === testProductId1)
       )
       const testProduct2Index = response.data.products.indexOf(
-        response.data.products.find((p) => p.id === "test-product2")
+        response.data.products.find((p) => p.id === testProductId2)
       )
 
       expect(testProduct2Index).toBe(3) // 200