name = Nuage Laboratoire
email = 123xyz…@cloudtestlabaccounts.com
It looks like you probably ran your app through Firebase Test Lab for Android (previously Cloud Test Lab) at least once, which will happen when you publish to an alpha or beta channel on the Play Store and opt into the free test. When you do a Robo test with FTL, it will attempt to log into your app with a test Google account in order to discover all of your app’s features.
The name of the user is intended to be clever. “Nuage Laboratoire” is French for “Cloud Lab” (Firebase Test Lab used to be called “Cloud Test Lab”).
https://stackoverflow.com/questions/40366572/who-owns-this-email-cloudtestlabaccounts-com