Add supervision packages to ProtectedPackages.

This commit updates the ProtectedPackages class to also protect
Supervision packages from being hidden/disabled/etc.

Change-Id: I5ac6b5aa38652b749eb714ae6799a264c5ea9598
Flag: android.content.pm.protect_supervision_packages
Bug: 404779514
Test: atest FrameworksMockingServicesTests:com.android.server.pm.ProtectedPackagesMockedTest