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CI has no Windows coverage: hadoop dependency bumps can silently break Windows development #6503

Description

@aglinxinyuan

Task Summary

Add a small Windows CI leg that exercises the OS-sensitive paths, so dependency bumps that break Windows development fail in the PR instead of on a dev machine weeks later.

Motivation: #6487 was a Windows-only regression that CI could not catch: the hadoop-common bumps #6201 (3.3.1 → 3.4.3) and #6227 (→ 3.5.0) made every local Iceberg write require winutils.exe, breaking all workflow executions on Windows dev machines — while ubuntu-latest and macos-latest CI stayed green. See the discussion in #6488.

A minimal starting point:

Runner windows-latest
Scope WorkflowCore unit tests (or just the file-system-sensitive specs, e.g. IcebergUtilSpec + WinutilsFreeLocalFileSystemSpec)
Would it have caught #6487? Yes — the regression test added in #6488 fails on a stock Windows runner without the fix

Notes / open questions:

  • A full build / amber Windows leg is likely too heavy (Windows runners are slower and billed at 2x; amber integration tests spawn Python workers via signal.SIGKILL, which does not exist on Windows), so scoping to unit tests of the storage/file-system layer keeps the cost low.
  • A Windows leg would also cover the Windows-only branches that Linux-based Codecov runs cannot execute.
  • Could run on main + dependency-labeled PRs only, if PR latency is a concern.

Task Type

  • Refactor / Cleanup
  • DevOps / Deployment / CI
  • Testing / QA
  • Documentation
  • Performance
  • Other

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