Jobs in 'active' apps are not subject to standby

Along the way we turn down the "app idle" tracking in the
jbo scheduler: it's now redundant with standby bookkeeping,
and was muddying the waters.

Bug: 74017233
Test: atest CtsJobSchedulerTestCases
Change-Id: I3220e6ef97f153b3f718e267a0dc4fbd3b926316