Option to skip negotiation option for SignalR C++ client

[wegylexy]

To avoid using sticky sessions, the client needs to skip negotiation and uses WebSockets. Since the C++ client only supports WebSockets anyway, there should also be a way to skip negotiation.
It could be .skip_negotiation(true) with the hub connection builder.

[analogrelay]

We have an item tracking work to get the C++ client up-to-speed with the options in the other clients. I'm going to close this as a duplicate of that one (but I made sure to call out "skip negotiation" specifically since it's definitely an important one).

Duplicate of #8716