Dump latest flow values from NotificationListVM

Including these values in the dump will allow us to more easily debug
issues related to the state of the viewmodel.

Minor adjacent changes included:
- move flowOn(bg) to the end of the flows to ensure as much work as
  possible gets done on the bg thread
- add missing flag check to headsUpAnimationsEnabled
- don't log pinnedHeadsUpRows all the time to avoid spamming the logs,
  we can get the latest value from the dump now

Bug: 328335095
Test: adb shell dumpsys activity service SystemUI
Flag: ACONFIG com.android.systemui.notifications_footer_view_refactor TEAMFOOD
Flag: ACONFIG com.android.systemui.notifications_heads_up_refactor DEVELOPMENT
Change-Id: I0d3952fe4374885b9c717977804baef279ab04fe