refactor: tweak option check

[mtth]

Also deduplicate tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.09%. Comparing base (d7567f3) to head (f556d7f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
packages/highs-solver/src/solver.ts	96.86% <100.00%> (ø)

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