Static Site Editor removing embedded videos

Problem

Editing a Handbook page in the Static Site Editor is stripping all the <iframe> data from embedded videos.

Details

See this MR: gitlab-com/www-gitlab-com!55602 (diffs)

Line 168 in the before file

It appears that the SSE is stripping all content from inside the <figure> tag.

Expected behavior

Until we support video embeds natively in the SSE, we should just leave this HTML alone.