Add getConstMdSpan coverage

[psychocoderHPC]

Split from local commit fc1e01f729b92091cfd23e61256add5af4860153.

Base branch: pr-add-packed-raw-makemdspan-coverage.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pr-add-getconstmdspan-coverage

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