[SysUI][Floaty][TempFix] Remove window if invocation effect not playing

Issue: (hard to repro) sometimes invocation effect isn't played on power
button press

Reason: Sometimes, in rare circumstances, rootview attached to window
isn't properly cleaned away and on next iteration onwards no new view is
being attached to the window due to a check "root == null" before
creating and attaching a view to window

Current temp fix:
* Creates a new state "isInvocationEffectHappening" to keep track
  of if invocation effect is being played or not
* If power button is lifted and invocation effect isn't being played,
  clean up the window
* If power button is lifted but invocation effect is being played, let
  the window be cleaned up after invocation effect finishes
* If due to any reason, window isn't cleaned up even in last point,
  before we attempt to add window next time, clean last added window
* Reset "isInvocationEffectHappening" to false after windows are
  cleaned up

Why not proper fix now?
* I am unable to consistently repro it but CL fixes almost all possible
  causes of this issue
* I don't like this solution, but to cleanly fix it might require us to
  move some logic into VM/repo which might require lot more changes
* This unblocks us Teamfood now

Bug: 414267753
Test: manual
Flag: com.android.systemui.shared.enable_lpp_assist_invocation_effect
Change-Id: I5198926318ebe7bc830e7ad39aaaf4e4e0713e80