Removed notifications when cancelling Stripe flows

no refs.
- removed notifications when clicking on the back button Stripe checkout either in update plan or in sign up flows

ghost/portal/src/App.js

@@ -209,13 +209,18 @@ export default class App extends React.Component {
     fetchNotificationData() {
         const {type, status, duration, autoHide, closeable} = NotificationParser({billingOnly: true}) || {};
         if (['stripe:billing-update'].includes(type)) {
-            const popupNotification = createPopupNotification({
-                type, status, duration, closeable, autoHide, state: this.state,
-                message: status === 'success' ? 'Billing info updated successfully' : 'Billing update was cancelled'
-            });
+            if (status === 'success') {
+                const popupNotification = createPopupNotification({
+                    type, status, duration, closeable, autoHide, state: this.state,
+                    message: status === 'success' ? 'Billing info updated successfully' : ''
+                });
+                return {
+                    showPopup: true,
+                    popupNotification
+                };
+            }
             return {
-                showPopup: true,
-                popupNotification
+                showPopup: true
             };
         }
         return {};

ghost/portal/src/utils/notifications.js

@@ -12,7 +12,7 @@ export const handleAuthActions = ({qsParams, action, status}) => {
 };
 
 export const handleStripeActions = ({status, billingOnly}) => {
-    if (!billingOnly && ['cancel', 'success'].includes(status)) {
+    if (!billingOnly && ['success'].includes(status)) {
         const statusVal = status === 'success' ? 'success' : 'warning';
         return {
             type: 'stripe:checkout',