Temporarily disable supervision when supervision app is no longer the profile...

Temporarily disable supervision when supervision app is no longer the profile owner, making the sync fully 1:1 with DPM.

This is being done to enable the migration of platform code to use SupervisionService while I find out the best way to enable supervision without requiring profile ownership.

Change-Id: Iff01812421fb8b1ad1cadb466e4544b35eaabfaf
Bug: 377261590
Flag: android.app.supervision.flags.enable_sync_with_dpm
Test: atest SupervisionServiceTest