chore: require form and error in the Props constructor

[Nic-Polumeyv]

props.form and props.error were each missed on the SSR side during review of #16547 and fixed in follow-up commits. Passing them through the constructor makes the next missed one a type error instead of a silent undefined in the rendered page.

pending_invalidate lost its export since nothing imports it.

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[Rich-Harris]

thank you