This test now:

1. sets up a node that speaks QUIC draft-29 and v1, and WebTransport
2. connects to that node, validating that if we're offered all 3 addresses, we pick QUIC v1
3. connects to that node, passing only the draft-29 address to the dialer, validating that we can dial a draft-29 connection
4. connects to that node from a node that only speaks WebTransport but not QUIC, validating that we can dial a WebTransport connection