fix: abort more descriptively for beforeunload #48960
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Description of Change
Closes #48912
Tracks the target of a pending navigation during beforeunload and, if the unload isn’t prevented, aborts the next load with a descriptive did-fail-load (ERR_ABORTED) instead of letting it fail generically. Also improves docs to point to
will-prevent-unloadbehavior aroundloadURL.Checklist
npm testpassesRelease Notes
Notes: none