Re-enable foreground service with special notification channel, upgrade ACRA version

Summary:
Insert back the foreground service notification (and permission), complying with Play Store

Also, avoid non-stop request of trip data that simply fails to download, giving rise to less notifications on devices that run Android < 12.

Test Plan: Check nothing is broken

Reviewers: valerio.bozzolan

Reviewed By: valerio.bozzolan

Subscribers: valerio.bozzolan, Libre BusTO

Tags: Libre BusTO

Differential Revision: https://gitpull.it/D161