Add a test checking that ART Metrics are enabled in ART's CMC collector. am: 92a1eacde8

Original change: https://android-review.googlesource.com/c/platform/art/+/2458349

Change-Id: I1a74e664da9ac39b72f499ae3bb19cba3fc4bc6a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>