Cancel badge scale anim when setting new badge scale

Otherwise it's possible the badge scale animation will override the
non-animated set value, which could mean a badge continues to show
even though it shouldn't:
- Animate badge scale to 1
- Before animation finishes, set badge scale to 0
- Badge scale ends at 1, since animation wasn't cancelled, so we
  continue to show it indefinitely

Also exported some properties in case a similar issue arises.

Bug: 111791593
Change-Id: Ia1a417239b909886adf9351e9bdc06a3b22d8b73