shadow test: Add tests for restricted discovery hidden services

gabi-250requested to merge
gabi-250/arti:arti-client-auth-tests into main

⚠ Do not merge until !2266 (merged) is merged ⚠

This is stacked on top of !2266 (merged).

The branch starts at 0490548e43d5751e7de3bef61a06dcf97b86175a.

This adds some new shadow tests involving a restricted discovery hidden service (fpqqmiwzqiv63jczrshh4qcmlxw6gujcai3arobq23wikt7hk7ojadid.onion) that has 2 authorized clients:

  • alice, configured in the restricted_discovery.static list of the service's TOML config
  • default, configured in authorized_clients/default.auth (via the restricted_discovery.directory.path setting)

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