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Previously we would check the request for a matching CDN hostname before applying the `Access-Control-Allow-Origin` header. That logic requires the CDN to include its public-facing hostname in the `Host` header, which is not always the case. Since we are only running this `apply_cdn_headers` before_action on publicly-accessible asset routes, we can simplify things so that the `Access-Control-Allow-Origin: *` header is always included. That will make CDN config requirements much more relaxed. At the moment, this is primarily relevant to the HighlightJsController routes, which are loaded using native JS `type=module`. But in the near future, we plan to expand our use of `type=module` to more critical JS assets like translations and themes. Also drops the `Access-Control-Allow-Methods` header from these responses. That isn't needed for `GET` and `HEAD` requests.