feat: detect bzlmod files marking workspace directory

Failed in 2h 3m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455440 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 8s
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Ran in 1h 2m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455440 -o bazelci.py && python3 bazelci.py runner --task=macos
Waited 1s
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Ran in 1h 0m
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455440 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 5s
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Ran in 58m 50s
:mac: macOScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455440 -o bazelci.py && python3 bazelci.py runner --task=macos_legacy_watcher
Waited 10s
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Ran in 59m 55s
:windows: Windowscurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1736455440 -o bazelci.py && python.exe bazelci.py runner --task=windows
Waited 3s
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Ran in 6m 46s
Total Job Run Time: 4h 21m