Make single onion service to rend and Tor2web to intro link authentication into a protocol warning
Single onion services and Tor2web connect directly to relays using untrusted link authentication keys.
These connections can cause a lot of warnings, particularly due to the link auth bugs in #26627 (moved).
We can either:
- downgrade all link auth warnings to protocol warnings on single onion services and Tor2web (this is the fast fix)
- taint untrusted link auth keys, and then downgrade connections using tainted keys to protocol warnings (this is very intrusive)
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