Blur ambient AOD wallpaper (Reland)

Bouncer: blur + zoomout. AOD: blur + no zoomout. Previous change (ag/31846198) introduced performance regressions due to separating the signals, which actually changed the behavior from overrding to max(wake, lock). Hence we are going back to using one siganl for wake and unlock, while adding a boolean variable to keep track of where the signal comes from.

Not a lockscreen expert, so the performance fix is mostly from the logic point of view. Let me know if you have any concerns about how signals from these two channels may overlap.

Bug: 397818296
Test: verified the behavior and ran the lockscreen suite for performance
Flag: com.android.systemui.shared.ambient_aod

Change-Id: Iacb68352bf839b9c487684f9f87fdb3105fa85fb