circ: Set proper timeout cutoff for HS circuits
Explicitly set the S_CONNECT_REND purpose to a 4-hop cutoff.
As for the established rendezvous circuit waiting on the RENDEZVOUS2, set one that is very long considering the possible waiting time for the service to get the request and join our rendezvous.
Part of #40694 (closed)
Signed-off-by: David Goulet dgoulet@torproject.org