MC-5650: Custom customer address attributes not displayed on Shipping or billing address form

- Added selector

Author: nathanjosiah

app/code/Magento/Checkout/Test/Mftf/Section/CheckoutPaymentSection.xml

@@ -13,6 +13,7 @@
         <element name="availablePaymentSolutions" type="text" selector="#checkout-payment-method-load>div>div>div:nth-child(2)>div.payment-method-title.field.choice"/>
         <element name="notAvailablePaymentSolutions" type="text" selector="#checkout-payment-method-load>div>div>div.payment-method._active>div.payment-method-title.field.choice"/>
         <element name="billingNewAddressForm" type="text" selector="[data-form='billing-new-address']"/>
+        <element name="billingAddressNotSameCheckbox" type="checkbox" selector="#billing-address-same-as-shipping-checkmo"/>
         <element name="placeOrderDisabled" type="button" selector="#checkout-payment-method-load button.disabled"/>
         <element name="update" type="button" selector=".payment-method-billing-address .action.action-update"/>
         <element name="guestFirstName" type="input" selector=".billing-address-form input[name*='firstname']"/>