Keep Tracking Jobs Whose Constraints Have Been Dropped

If a job is close to its deadline than FC will stop tracking it. But if
the deadline changes then the job could wind up in some FC data
structures but not others, and data will not be cleaned up properly when
the job is complete. By continuing to track jobs with 0 constraints and
only stopping when the job is completed, we can avoid this edge case.

Bug:243167593

Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/job
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/job
Test: atest CtsJobSchedulerTestCases
Change-Id: I665b9f07675e8c18f6dcdaf8813794213f95139b