Remove macos_workflow

[jsoref]

Test Plan

How do we know the code works?

The workflow is disabled: https://github.com/Flank/flank/actions/workflows/macos_workflow.yml

When run, it has a fatal error: https://github.com/check-spelling-sandbox/flank/actions/runs/11876389549

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Checklist

• [ ] Documented
• [ ] Unit tested
• [ ] Integration tests updated