Crowdsignal embeds are cropped

Automatic height is not working on Crowdsignal embeds (Quiz block), resulting in cropped survey embeds.

A possible workaround is using a Crowdsignal shortcode instead of a Crowdsignal block, setting the height manually:

`[crowdsignal type="iframe" survey="" height="1500px" domain="" id=""]`

Context: 9252368-zd-a8c

No file or test is named. Start by locating the Gutenberg Quiz block's Crowdsignal embed height handling and reproduce the cropped survey with automatic height. Done means Crowdsignal survey embeds in the Quiz block expand to their content without requiring the manual-height shortcode workaround.

Written by the indexing model from the issue text.