Add cache for OEmbed endpoints to avoid extra HTTP requests (#12403)

Add cache for OEmbed endpoints to avoid extra HTTP requests (#12403)

* add youtube oembed endpoint

* add check for oembed endpoint

* change unless for a more readable if

* clear blank lines

* endpoint via https

* Fix string literal in condition

* use cache for endpoints

* use cache for endpoints

* clean up and adding check

* clean up and remove redundant return

* add html check

* add false to return

* use double quotes

* use double quotes

* Clean up