[firebase_analytics] Ignore testlab devices

[ciriousjoker]

Is your feature request related to a problem? Please describe.
When distributing an app to the play store, Google automatically tests the app. This generates fake analytics.

Describe the solution you'd like
Please ignore testlab devices when sending analytics data.

Additional context
Here's how this could be implemented. Check for the value of the system setting "firebase.test.lab".

More details:
https://stackoverflow.com/questions/39404078/how-to-prevent-play-store-testing-from-affecting-firebase-analytics

[RicardoRB]

How is the progress of this? It would be great to have it. My implementation doesn't work.

[RicardoRB]

Anyone has a way to resolve this? @Ehesp @kirstywilliams @Salakar @helenaford