Split logs for actual BAL blocks vs potential blocks

Enabling the feature for potential blocks (i.e. reporting blocks that would happen
when the app is upgrading the target SDK without any code change) is too
annoying in staging.

Bug: 25198068
Test: atest BackgroundActivityLaunchTest
Change-Id: I3f700e025166647e8d86d725cd0ec165b0666c89
2 files changed