Display .onion alt-svc route in the circuit display

Now that legacy/trac#24553 (moved) has re-enabled alt-svc, the Circuit Display should probably indicate when the connection was made via an .onion alt-svc. Currently it doesn't.

Feel free to use this for testing: https://perfectoid.space/test.php When the page turns green, click on the green https lock to see the circuit.

Trac:
Username: mahrud