Deprecate UM's Application Restrictions APIs to use DPM's.

Original CL: ag/31887757

- Allow app with permission to call app restrictions in non-parent context.
- Add migration code to import existing app restrictions state into DPE.
- Support restricted users through Settings.

Test: atest android.devicepolicy.cts.ApplicationRestrictionsTest and manual testing migration
Flag: android.app.admin.flags.app_restrictions_coexistence
Bug: 369141952
Change-Id: I1aec9175ca8e6474697e053576d069e3b7f75071