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0723b0915550a0af9d1eb2952ee193238eee8178 by Thiago Neves <thiagohneves@gmail.com>:
fix(tests): use mock GCS client in artifact service tests to avoid real credentials
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/601 from thiagoneves:fix/mock-gcs-client-in-tests e7d16719b9c3116b652988d2ed1b1f8893686f3e
PiperOrigin-RevId: 756381115