Fix metadata nested twitter props rendering (#47972)
For twitter and og image nested properties we should render them as
snake case according to [og spec](https://ogp.me/) and [twitter card
docs](https://developer.twitter.com/en/docs/twitter-for-websites/cards/guides/getting-started).
For typing we keep them as camel case and then convert them to snake
case during render
This issue is reported in #47960 that user thinks the types are
incorrect, but turns out twitter metadata didn't render it correctly
Closes #47960
