Optimize gesture by allowing the original work in progress tree to be a suspended commit (#35510)

Stacked on #35487.

This is slightly different because the first suspended commit is on
blockers that prevent us from committing which still needs to be
resolved first.

If a gesture lane has to be rerendered while the gesture is happening
then it reenters this state with a new tree. (Currently this doesn't
happen for a ping I think which is not really how it usually works but
better in this case.)