Fix status check for proxy

[conniey]

Issue created from:

https://www.rfc-editor.org/rfc/rfc9110.html#name-connect

As per this, we should allow any 2xx response to consider success. We are currently working with proxy server which is sending 200 Connected as response. This has forced us to use older version of Azure Service Bus Java SDK that has dependency for older version of qpid-proton-j-extensions before this change. Suggesting to revert this validation.

See: https://github.com/Azure/qpid-proton-j-extensions/blob/master/src/main/java/com/microsoft/azure/proton/transport/proxy/impl/ProxyHandlerImpl.java#L71

[bluepixbe]

From my point of view covering the same as #63