Add pre-deprecated "after-merge-finish" transaction

* This should not be used except in the rare case where
it needs to "overwrite" an ordered finishT due to the
use of finishWCT (as is the case currently w/ recents).
* We now always move tasks that are opening to the closing
queue if we detect it's a swipe to home

Bug: 320403561
Test: perform quickswitch + swipe-up rapidly
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9af944f95f02dc189afc5b3d1702ef1c9781b0cc)
Merged-In: I901736891d1e3e5df481d6a47d43fc34b600d981
Change-Id: I901736891d1e3e5df481d6a47d43fc34b600d981