Remove cancelling snap animation

This CL improves the animation in two ways:
1. Doesn't cancel an ongoing animation when slider receives the new value. This is usefull when adjusting volume with physical buttons and makes it smoother.
2. Debounce upcoming values to prevent slacking behind when the user flings the slider.

Flag: EXEMPT BUG_FIX
Fixes: 433505724
Test: manual on foldable. Adjust volume with various gestures in both Volume Panel and Volume Dialog.
Test: atest VolumeDialogScreenshotTest
Test: atest VolumePanelScreenshotTest
Change-Id: I0f56b5cfd6ea99e0b00e250f2a0839db76fcced3