Better Support for profiles in "People that can interrupt"

* Show contacts from personal and work profile.
* Open personal or work profile Contacts app when choosing settings.
* Skip conversations with no ShortcutInfo (they are returned for a disabled work profile but we cannot show an icon for them).

Fixes: 371513451
Test: atest com.android.settings.notification.modes
Flag: android.app.modes_ui
Change-Id: Id8653a85ee4fd15dfccbecb3ea2d31e615d29f8c