Add testing notes for the cherry picked PR

Author: tarhi-saad

docs/internal-developers/testing/releases/960.md

@@ -162,6 +162,15 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 5. Save and go to the `shop` on the front end, make sure it renders the `Products (Beta)` block with the `Catalog Sorting` dropdown.
 6. Change the dropdown value and make sure the products are ordered in the expected order.
 
+### Checkout - Allow partial pushes of address data to work before a country is provided ([8425](https://github.com/woocommerce/woocommerce-blocks/pull/8425))
+
+1. WooCommerce > Settings > General, set "Default customer location" to no address.
+2. Logged out, in a new browser window/incognito mode, add something to the cart and go to checkout.
+3. Enter your email address, a first name, and a last name.
+4. Apply a coupon.
+5. When the coupon has applied, ensure the address fields you entered were not removed.
+6. Successfully place an order.
+
 ## Feature plugin
 
 ### Fix: The experimental typography styles for the Store Breadcrumbs block are now restricted to the feature plugin. ([8345](https://github.com/woocommerce/woocommerce-blocks/pull/8345))