[benchmarking] add new tag for mac 10.13
[benchmarking] add new tag for mac 10.13

Adding new tag to allow disabling story only on mac 10.13 bots.

Bug: chromium:1177965
Change-Id: Ifa4cf5a26909f88548eb34aac9017abb21f9f9cd
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2693792
Auto-Submit: Wenbin Zhang <45ad8a1ff616a38a2202fd35571df81897c5f14f@google.com>
Reviewed-by: John Chen <334fbfbb4df7c78f091ea1b77c69ca6ac731a3f3@chromium.org>
Commit-Queue: John Chen <334fbfbb4df7c78f091ea1b77c69ca6ac731a3f3@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult