fs: preserve rmSync errno for filesystem errors

[icecold009]

Summary

• Preserve errno values from std::filesystem failures in fs.rmSync().
• Add Linux regression coverage for EINVAL from a trailing-dot path.

Fixes: #65884

Tests

• node --check test/parallel/test-fs-rm.js
• git diff --check

The full Node.js test could not run on this Windows host because symlink creation is denied, and this sparse checkout has no native build output.

[github-actions]

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