dirauth: Remove Faravahar from code

Remove Faravahar from the code until its operator can bring it back online outside Team Cymru's network.

changed milestone to %Tor: 0.4.8.x-freeze

added Backport label

assigned to @dgoulet

/cc @gk

added For Network Health Team label

mentioned in merge request !631 (merged)

mentioned in issue #40689 (closed)

added Icebox label

removed Icebox label

closed with commit efad4364

mentioned in commit dgoulet/arti@5ea8c8ee

mentioned in merge request arti!924 (merged)

mentioned in issue tpo/network-health/depictor#18 (closed)

mentioned in issue tpo/network-health/doctor#40030 (closed)

mentioned in commit gk/doctor@6d269425

mentioned in merge request tpo/network-health/doctor!12 (merged)

added Network health label

mentioned in issue tpo/network-health/bwauthealth#10