fix: fix product Id to match ecommerce spec (#803)

Co-authored-by: Alan Charles <[email protected]>

Author: alanjcharles

packages/plugins/plugin-braze/src/methods/__tests__/track.test.ts

@@ -245,7 +245,7 @@ describe('#track', () => {
         revenue: '399.99',
         products: [
           {
-            productId: '123',
+            product_id: '123',
             price: '399.99',
             quantity: 4,
           },

packages/plugins/plugin-braze/src/methods/track.ts

@@ -42,10 +42,10 @@ export default (payload: TrackEventType) => {
 
         products.forEach((product) => {
           const productDict = Object.assign({}, product);
-          const productId = productDict.productId;
+          const productId = productDict.product_id;
           const productRevenue = extractRevenue(productDict, 'price');
           const productQuantity = productDict.quantity;
-          delete productDict.productId;
+          delete productDict.product_id;
           delete productDict.price;
           delete productDict.quantity;
           let productProperties = Object.assign(