[dashboard] Extend PAYG

- made re-entry safe
- check: old subscription already cancelled
- check: stripe subscription already exists
- cancel all kinds of subscriptions
- migrate members for TeamSubscription
- choose org for TeamSubscription
- don't show notification on PAYG page
- show confetti at the end :-)

Author: geropl

components/dashboard/src/AppNotifications.tsx

@@ -119,3 +119,7 @@ function convertToAppNotification(array: string[] | AppNotification[] | any): Ap
     }
     return notifications;
 }
+
+export const resetAllNotifications = () => {
+    removeLocalStorageObject(KEY_APP_NOTIFICATIONS);
+};