Fix some state issues with user-controlled animations

Previously, user-controlled animations weren't properly being canceled when a
non-user-controlled animation started, e.g. when hitting home. Thus, we could
end in the wrong or inconsistent state because the user-controlled animation's
end runnable was still used. Now we add a cleanup callback for when we reset
the user-controlled animation for one that isn't user-controlled.

Also fixed a couple typos.

Tests (easier with animation durations extended):
- Swipe up and hit home before reaching overview -> land on home
- Go to overview, swipe down slightly (before threshold to go to workspace)
  and let go -> return to overview without flash (recents was resetting)
- Swipe up, press home while swiping -> goes home, stops responding to drag
- Start dismissing task and hit home before it finishes (or while dragging)
  -> goes home, stops responding to drag

Bug: 78249220
Change-Id: If11d8999e3fadba38c987b25af67cd2304cd859b