Skip syncs for packages in a stopped state.

Add temporary logic to skip syncs for force-stopped packages. This logic
will become a no-op and should be removed once JobScheduler handles this
itself.

Bug: 209852664
Test: atest CtsSyncManagerTest
Test: manual
Change-Id: Ib0cda0c804cf0d5ec3ee4083d61b5569a3c5d70d