Bubble v2 animation changes.

Including:
- expanded view expands/collapses from top of itself
- small icon on avatar shows on left side when bubble is on right side
- when expand on bottom, bubble move up a bit so that expanded view doesn't go off screen. It also go back to previous position when collapse.
- remove animation for collapse when move expanded bubble

This change should not enable bubble v2 for anyone.

Bug: 67605985
Test: manual
PiperOrigin-RevId: 177974562
Change-Id: Id83f3f744b717d51fbe58e58769ac2cd2810d2b5