Capture iframe content in auth report

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This would enable a customer to see the HTML on a login form and that may help the customer debug this without intervention from engineering.

The auth report includes the DOM at each step of the auth flow using the DevTools method DOM.getOuterHtml. This method does not include iframe contents, shadow DOM elements, or certain other types of content in the page. This can make it difficult to troubleshoot auth flows where these elements exist (see customer issue).

Using Page.captureSnapshot (currently marked "experimental") would capture these missing pieces.