hs: Change the error for a collapsing client circuit

David Gouletrequested to merge
dgoulet/tor:ticket40692_048_01 into main

Change it to an "unreachable" error so the intro point can be retried and not flagged as a failure and never retried again.

Closes #40692 (closed)

Signed-off-by: David Goulet dgoulet@torproject.org

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