[AppOps] Make some corrections towards UidState initialization

We don't need to create UidStates for apex or create sandbox uids for
any uid less than application uid. We should also clean up uid states
that have been persisted but shouldn't exist.

Bug: 320850079
Test: Successful boot and improved performance with child CL observed
Change-Id: I641bb381eee8962f4432254029c93d505d327980