Disable runtime image tests while investigating b/268225365. am: 766fa7d3d9 am: bf517ff72f am: b7a7d81900

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

Change-Id: I0689dda0cbdedb5a1095b3af79c5e17d42e9f670
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>