Remove allowed_protocol_schema_set backwards compat in BaseConnector

[bdraco]

As a followup to #8632 (ref #8600)

A future PR should remove allowed_protocol_schema_set in BaseConnector as its only there for backwards compat

          > It looks like the aiodocker is already doing that, I see in the code:

We're aware of that. The point is that currently the client just tries a whitelist of protocols, but really the whitelist should depend which connector is being used (http:// won't work if UnixConnector is used, for example).

I guess tcp:// should be added to the list? I'm not aware of this being a recognised URL protocol though, so not sure why that is in use..

Originally posted by @Dreamsorcerer in #8600 (comment)

[bdraco]

The fix was merged without npipe/tcp/unix in the base connector.