Split inheritance structure between OpenAppFromLauncher and OpenAppFromLock tests

OpenAppNonResizeableTest was inheriting from OpenAppTransition which specified assertions assuming the app was launched from the launcher but that isn't the case there, we launch from the lock screen

Test: atest FlickerTests:OpenAppColdTest FlickerTests:OpenAppFromOverviewTest FlickerTests:OpenAppNonResizeableTest

Bug: 213856453
Change-Id: I4bc1eca68598471452e4cac94903f0d92dba635b