Disable runtime image tests while investigating b/268225365. am: 766fa7d3d9 am: bf517ff72f

Original change: https://android-review.googlesource.com/c/platform/art/+/2426114

Change-Id: Ifb615a54ffdc4487dbe78d80d8ceb410f64a8d8d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>