EBS: Exempt jobs scheduled for foreground apps

Jobs that are scheduled when the service app is in the foreground
(as opposed to the calling app being in the foreground) will be exempted
from EBS job throttling, *unless* they have time constraints.

Bug: 72125364
Test: Manual test with sync
Test: atest CtsBatterySavingTestCases
Test: atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/job/JobStoreTest.java
Test: atest $ANDROID_BUILD_TOP/frameworks/base/services/tests/servicestests/src/com/android/server/ForceAppStandbyTrackerTest.java
Change-Id: Ied7e24b0dbb104d5d7f95f853ab939cd9a403456