[Notif] Add custom view to made undo text push button down

Added a custom FrameLayout that computes the correct height if the text
overlaps with the button and re-positions the button to be below the
text as necessary.

Test: Manually tested w/ different text, including layout bounds + RTL
Change-Id: I80b0eb4ce3a108d350924d6a7b964cd0b59f1cac
Fixes: 77810898
Bug: 109839789