Fix /api/v1/admin/accounts (#17887)

* Fix /api/v1/admin/accounts

Compatibility was broken since #17009 which changed the underlying filter class
without changing the controller.

This commits restore support for the old parameters.

* Add /api/v2/admin/accounts with the new parameters

* Add tests

* Add missing filter for `silenced` status

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

config/routes.rb

@@ -576,6 +576,10 @@ Rails.application.routes.draw do
       resources :media, only: [:create]
       get '/search', to: 'search#index', as: :search
       resources :suggestions, only: [:index]
+
+      namespace :admin do
+        resources :accounts, only: [:index]
+      end
     end
 
     namespace :web do