Make the flyout color animation smooth

This change updates the flyout animation interpolator to an
emphasized curve and updates the color animation so that it completes
within a shorter period of time. Speeding up the color animation
makes the color transformation smooth.

Flag: com.android.wm.shell.enable_bubble_bar
Fixes: 378077265
Test: atest BubbleBarViewAnimatorTest
Test: atest BubbleBarFlyoutControllerTest
Change-Id: Idd38fc71543f629aeb568d72386a9b9def51c307