Use a simple listener to notify NotificationShadeDepthController whenever blur gets applied.

This takes the implementation as close to the previous implementation as possible. The expectation is that the shade expand/collapse CUJs performance should remain improve after this change.

Bug: 393199337
Bug: 395579809
Test: verified everything works
Flag: com.android.systemui.bouncer_ui_revamp
Change-Id: I21d53b7039aeb7b11ab179b521839e50da739622