Modify TestSceneScrollingHitObjects to contain a test case that serves
as a reproduction for a visual bug in which using the overlapping scroll
algorithm results in an incorrect origin adjustment for lifetime.
To better demonstrate the desired effect of the fix introduced in
193e41f, refactor TestSceneScrollingHitObjects to contain two tests,
one of which contains the pre-existing controls to test scroll
algorithms, and the other aims to showcase the fix by setting scroll
parameters appropriately.
