Configure rollback availability separately in RollbackPackageHealthObserver.

For extended rollback work, rollback will be retained for 60 days for adb or server-side triggered rollback. However, it will still be available just for 14 days for automatic on-device triggering and thus, we configure the rollback availability separately in RollbackPackageHealthObserver.

Test: presubmit
Test: atest RollbackPackageHealthObserverTests
Bug: 416259905
Flag: com.android.crashrecovery.flags.configure_package_health_observer_rollback_timeout
Change-Id: I39a74ab26130554e30d5a7f183fc34ab141a7a35