This changeset removes the `wp_ajax_save_attachment_updated` hook by reverting [55106], [55111], and [55450], to give it more time for further discussions as there are still concerns about whether this hook is necessary.
Follow-up to [55106], [55111], [55450].
Props costdev, SergeyBiryukov, peterwilsoncc, azaozz.
See #23148.
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