Support listing beta projects

[spigelli]

• Allow configuring a folder to or configuring every command to point at the projects beta api
• List beta projects

[rethab]

would the beta projects api replace the (old?) rest api?
would you suggest to replace the existing list command with this? Or possibly behind a --beta flag?

[spigelli]

I haven't found much info on the beta's timeline and all the qraphql fields for beta are prefixed with ProjectNext, so it's probably fine that current projects commands get kept as rest.
The --beta flag is probably fine for now, it would be nice if it could have something like cli/cli#4332 describes since the beta will probably go out as a Github Teams and up only feature.

Also I remember seeing a blurb saying that repo specific projects would be added to the beta, so maybe a repos could be individually configured via an environment variable? I don't like the idea of using env vars but I don't see how it could be pretty without cli/cli#4332