Enable amp-img to be rendered inside amp-list in story page attachment #39806
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For amp-list embedded in the amp-story-page-attachment, because the attachment is initially in nodisplay mode, the layoutCallback of all amp-img elements are not called at all, even after the attachment is opened and amp-list fetches results and inserted built amp-img(from templates) into DOM. Force call layoutCallback to render images.
Fix #39707 and #33241.