Record Skyframe node counts in the JSON trace profile with `--experimental_collect_skyframe_counts_in_profiler`.

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:pipeline:
:pipeline:curl -sS "https://raw.githubusercontent.com/fweikert/continuous-integration/token/buildkite/bazelci.py?$(date +%s)" -o bazelci.py && python3.6 bazelci.py --script https://raw.githubusercontent.com/fweikert/continuous-integration/token/buildkite/bazelci.py project_pipeline --print_shard_summary --http_config=https://raw.githubusercontent.com/fweikert/bazel/macos_v2/.bazelci/postsubmit.yml | tee /dev/tty | buildkite-agent pipeline upload
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Total Job Run Time: 33s