17/ Update activity tracker callback

- Immediately callback when scheduling activity tracker callback and the
  activity already exists
- Remove LauncherInitListenerEx, it was only used to update the prediction
  ui state, but not all of the callers of the launcher activity init
  listener actually needs this (ie. Go doesn't have overview predictions,
  overscroll input consumer/touch interaction service doesn't need it.)

  Instead we only call it in the places we need it LauncherSwipeHandler (for
  swipe up) and OverviewCommandHelper (for the nav bar button).

Bug: 141886704

Change-Id: I890a45e658be813e99b2a02f179fce611ede9ce8