Log not impacted cases

While cases that are not impacted by BAL hardening are not critical for
us right now, it is important to log these to see future impact.

This does not change the behavior, just logging, as `mBalAllowedByPiCreatorWithHardening` implies `mBalAllowedByPiCreator` and both result in `allowBasedOnCaller`.

Test: atest BackgroundActivityStartController
Bug: 296478951
Change-Id: Ic26ae6967ccbbc781091ac4a64e9b13a5bff5da9