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

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

Change-Id: I781096cc86aaf89c45b382307ed68636631b849a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>