Mark caliper-tests as not unit tests am: c584a577cd am: d5dbd458d3 am: 34343aad43

Original change: https://android-review.googlesource.com/c/platform/external/caliper/+/1605593

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2834e951011e8b7584b0a319ea520d8bdfcd878f