hs-v3: Check the ed25519 key when picking intro point

If the intro point supports ed25519 link authentication, make sure we don't
have a zeroed key which would lead to a failure to extend to it.

We already check for an empty key if the intro point does not support it so
this makes the check on the key more consistent and symmetric.

Fixes #24002

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

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