[Flexiglass] Notify NotificationLockscreenUserManager when the device public mode changes

With Flexiglass, NotificationLockscreenUserManager determines whether the device is in
public mode by querying DeviceUnlockedInteractor.isUnlocked, however it is only notified
that it needs to refresh its state on StatusBarState changes. The problem is that when
the device gets locked, StatusBarState flips first, and the isUnlocked state flips later.

This CL pokes the NotificationLockscreenUserManager directly, whenever the isUnlocked state
changes, and adds a listener to the NSSLC for isAnyProfilePublicMode() changes.

Fixes: 440335509
Flag: com.android.systemui.scene_container
Test: lock the device   -> notifications are showing their sensitive content
Test: unlock the device -> notifications reveal their private content
Change-Id: I97943629afb22617b6ea0de97418ba87feb6b8ef