Disable gesture when split invoked from in-app taskbar

* Previously gesture was disabled when we started both apps
from launcher (overview, workspace, all apps etc)
* This handles the case when we start split from in-app taskbar,
in that case the transitions finishes much faster and launcher was
getting the disable flag turned off before the side animation finished.
* Now for enter transitions that are resizing, we delay turning the
disable flag off until after the animation completes
* Button nav version of this still needs to be handled (separate path
from sysui flags, I think?)

Bug: 290893291
Test: No longer able to swipe up after starting split from in-app
taskbar. Other swipe invocations are still disabled
Flag: EXEMPT bugfix

Change-Id: Ib489f2b63466c6552a4a2c9c13577844c4b71036