[INTERNAL][FIX] sap.m.Carousel: Fixed unstable QUnit test
[INTERNAL][FIX] sap.m.Carousel: Fixed unstable QUnit test

The test relies on the fact that the next repaint didn't happen.
Now requestAnimationFrame is stubbed, so that we ensure that it really
didn't happen.

Change-Id: Ib6c979bb88cd7b6f411a6905a4af6d0e573b08af
BCP: 2080167984

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5