[tor-bugs] #27797 [Core Tor/Tor]: node: Make node_supports_v3_rendezvous_point() also check for the onion_pk

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#27797: node: Make node_supports_v3_rendezvous_point() also check for the onion_pk
-------------------------+-------------------------------------------------
     Reporter:  dgoulet  |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  tor-hs, tor-relay, 033-backport,
     Severity:  Normal   |  034-backport
Actual Points:           |  Parent ID:  #27774
       Points:           |   Reviewer:
      Sponsor:           |
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 Turns out that we think this is related to #27774.

 A client selects a v3 RP by only looking at the protover but it is
 possible that at that time we simply don't have the descriptor yet thus
 missing the `onion_pk` which led to a failure when sending the INTRODUCE1
 cell.

 Like `node_supports_ed25519_link_authentication()` does, we should simply
 check for the `onion_pk` as an extra step to the protover.

 Flagging this for backport.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27797>
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