FIX: Always return secure_proxy_without_cdn url for secure media (PR #8394)

There was an issue on dev where when uploading secure media, the href of the media was correctly being replaced in the CookedPostProcessor, but the srcset urls were not being replaced correctly. This is because UrlHelper.cook_url was returning the asset host URL for the media for secure media instead of returning early with the proxied secure proxy url.

GitHub

You’ve signed the CLA, martin-brennan. Thank you! This pull request is ready for review.

The title of this pull request changed from “Always return secure_proxy_without_cdn url for secure media” to "FIX: Always return secure_proxy_without_cdn url for secure media