Add xctrunner and xctrunnertool

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:pipeline:curl -sS "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?$(date +%s)" -o bazelci.py && python3.6 bazelci.py project_pipeline | tee /dev/tty | buildkite-agent pipeline upload
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Current LTS on :mac: macOS arm64curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1741117127 -o bazelci.py && python3 bazelci.py runner --task=macos_latest
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Last RC Bazel on :mac: macOS arm64curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1741117127 -o bazelci.py && python3 bazelci.py runner --task=macos_last_rc
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Last Green Bazel on :mac: macOS arm64curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1741117127 -o bazelci.py && python3 bazelci.py runner --task=macos_last_green
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Doc tests on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1741117127 -o bazelci.py && python3.8 bazelci.py runner --task=doc_tests
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Total Job Run Time: 2m 32s