[Flexiglass] Wire in CUJ_NOTIFICATION_SHADE_SCROLL_FLING

CUJ_NOTIFICATION_SHADE_SCROLL_FLING tracks any scrolls on the
Notifications. It starts when a swipe starts to scroll up/down the
stack, and stops when the scrollable element has settled including any
flings or overscroll effects.
This CL starts tracking it from the Notification placeholder composable.

Bug: 360100111
Test: OffsetOverscrollEffectTest
Test: manually verify the CUJ marker calls on scrolls, flings and overscrolls
Flag: com.android.systemui.scene_container
Change-Id: Ib1a98438de987711023a28fc2a7cdf95675e8f5e