chore: restore error pages for pages router to play safe #18613
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What does this PR do?
pages/_error
andpages/404
to play it safe. Theoretically, these should be error pages both for pages router and for app router. They shouldn't conflict with each other (theoretically). But I can't test this surely unless we test in production env (QA).Mandatory Tasks (DO NOT REMOVE)
How should this be tested?