feat: detect bzlmod files marking workspace directory

Failed in 1h 7m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 9s
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Ran in 1h 6m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 2s
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Ran in 11s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 7s
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Ran in 16s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 8s
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Ran in 59m 16s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 4s
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Ran in 9s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 7s
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Ran in 10s
:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455340 -o bazelci.py && python.exe bazelci.py runner --task=windows
Waited 8s
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Ran in 5m 57s
Total Job Run Time: 2h 25m