Simplify failed checks search for re-run#4925

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ievdokdm wants to merge 3 commits intoflutter:mainfrom

ievdokdm:181334-fix

Commits on Jan 24, 2026

Fusion checks are not scheduled if any engine checks are failed so no need to look up for failed checks in both, only last guard might have failed checks.
ievdokdm
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fix namings and comments
ievdokdm
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fix: https://github.com/flutter/flutter/issues/181425
ievdokdm
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