[automerger skipped] RESTRICT AUTOMERGE: add "mcts" tag to MainlineCTS tests. am: 9204f330f3 -s ours

am skip reason: contains skip directive

Original change: https://android-review.googlesource.com/c/platform/packages/modules/StatsD/+/3144216

Change-Id: I3e731d469150acc6500c43aecb057761d90c849b
Signed-off-by: Automerger Merge Worker <[email protected]>