Fixed accidental `undefined` omissions in union props sourced from index types under `noUncheckedIndexedAccess`#61233

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Andarist wants to merge 3 commits intomicrosoft:mainfrom

Andarist:fix/missing-type-omission-union-prop

Commits on Feb 20, 2025

Fixed accidental `undefined` omissions in union props sourced from index type under `noUncheckedIndexedAccess`
Andarist
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Commits on Dec 5, 2025