Running tests for BCR

Format bcr_validation.py & registry.py w black (#3820)

Passed in 1m 3s
: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
Waited 10m 46s
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Ran in 16s
ubuntu on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1740004855 -o bazelci.py && python3.8 bazelci.py runner --task=linux
Waited 9s
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Total Job Run Time: 55s