Do not warn on HTTP connection from Smart proxy
When ssl is enabled, pure HTTP connections on smart-proxy enabled endpoints are allowed, just to throw an warning about such behaviour.
To support this further in Rails 6.1 would be big effort (because of #30122) with very little benefit.
Fixes #34234 - do not allow HTTP on SmartProxy Auth
SmartProxyAuth enabled on its endpoints HTTP to log a message, that ssl is required.
This in not necessary and it is hard to keep for the future as Rails 6.1 will make that harder.
There is not too much benefit from this, so it's better to drop it.