Log reset notification content view alphas

Add logs to track when we reset/skip resetting the content view alphas
to prevent regression.

Bug: 292024656
Bug: 342212697
Test: atest SystemUITests
Flag: com.android.systemui.notification_content_alpha_optimization
Change-Id: I6ffb164aa21fbab995f0d21eff1d3cbc5b9c93bf