Blocking home screen items for Private Profile

In this Cl we block:
1. Widgets
2. User Added App Shortcuts

Bug: 287975131
Test: atest FrameworksServicesTests
Flag: ACONFIG android.multiuser.disable_private_space_items_on_home
DEVELOPMENT

Change-Id: Ie15e067266447d170dc7dc8272997bd44317c90f