Add a test checking that ART Metrics are enabled in ART's CMC collector. am: 92a1eacde8 am: bf3f435550

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

Change-Id: I9bded75f3805d8e358e38b4f1d51437715947d4b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>