[Safety Labels] Enable safety labels features for preloaded apps

This CL includes preloaded apps' safety labels to be displayed in the
UI, if they have provided safety labels. Earlier, they were filtered out
as only store-installed apps' safety labels were surfaced in the UI.

Bug: 261607291
Test: atest CtsPermission3TestCases
Test: atest PermissionControllerMockingTests:LightInstallSourceInfoTest
Change-Id: I6ac5336fcc5441c31e38172fab29189be1761416