Dump ENR custom outlines

Applying a custom outline to the notification row would be one more way
to get to the "empty space in shade" state, and yet it is not included
in the bugreports. We use this clipping for intro/outro animations.

Bug: 369608449
Test: dumpsysui NotificationStackScrollLayout
Flag: EXEMPT changing dumps only

Change-Id: I6a0f75922383bce1dd35692208471cba75ae69f3