Replace Contextual Rotation Button with Floating Action Button

When foldable is in 3 button, the rotation button is covered by the device’s camera cutout upon 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: I8bd9acdeec8ade4c8183c42056bf67b1c825906c
Merged-In: I8bd9acdeec8ade4c8183c42056bf67b1c825906c