Select the protocol to be used by Signalr

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

Connecting clients fail when scaling in during autoscaling.

### Describe the solution you'd like

We want to be able to select the protocol to be used by Signalr, and by selecting long polling, we want to be able to scale in when autoscaling. Connecting users without errors.

### Additional context

We plan to use Blazor Server. One of the challenges is that it is difficult to scale in.