Allow the FGS with soft denied permission to start

..if it's allowed to have while-in-use capability.

Permissions like mic/camera/location would have a soft-denied mode,
where it basically means "MODE_IGNORED", we shouldn't throw exceptions
in this case but silently fail. But if they have the while-in-use
capability, it should be safe to allow them to start the FGS.

Bug: 280936347
Test: atest CtsAppFgsTestCases
Change-Id: I2e690f9dd9574f9ce0d3e7cb702eb53dced99a37