fix: status should be 404 when render the DefaultNotFound page

[yimingjfe]

Summary

This PR is mainly to solve the issue at #7136, when rendering the default 404 page, the HTML status code should also be 404.

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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Latest commit: e8208c1

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