Add /api/v1/accounts/familiar_followers to REST API (#17700)

* Add `/api/v1/accounts/familiar_followers` to REST API

* Change hide network preference to be stored consistently for local and remote accounts

* Add dummy classes to migration

* Apply suggestions from code review

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

config/routes.rb

@@ -493,6 +493,7 @@ Rails.application.routes.draw do
         resource :search, only: :show, controller: :search
         resource :lookup, only: :show, controller: :lookup
         resources :relationships, only: :index
+        resources :familiar_followers, only: :index
       end
 
       resources :accounts, only: [:create, :show] do