Move away from Cloudflare Tunnel centric operation

[AnimMouse]

The cloudflared daemon is not just about cloudflared tunnel anymore, we now have cloudflared access that allows GitHub Actions runner to access services behind Cloudflare, cloudflared service for tunnels configured via dashboard, and TryCloudflare that allows to use Cloudflare Tunnel without an account and domain name.

Moving away from Cloudflare Tunnel centric is the way forward, but this will break many workflows that depend on setup-cloudflared, so moving to v2 is required.