Don't call onAppsUpdated() when in testHarness

Suspect that the jump in these flakes where it cannot find the private space container is due to this calculateDiff call when onAppsUpdate() is called

bug: 355466672
Test: tapl presubmit and vid: https://drive.google.com/file/d/1hshI6g7oqvi45EiO92Rl4e-gaXfDVe_b/view?usp=sharing
Flag: NONE trying to fix flake
Change-Id: I0bff416624c5b9e2cb7a4fe32834f9d521507922