Replace Contextual Rotation Button with Floating Action Button

When foldable is in 3 button, the rotation button
 is covered by device camera cutout on rotation.

This CL replaces Contextual Rotation Button with
Floating Action Button for taskbar and navbar.

Flag: NONE
Test: Manually tested on Felix & panther.
Bug: 324070001
Change-Id: I8c5b61033f0b32b6557b96d572d8de66d3e77e4c