remove invisible and unused transfer_all feature

app/controllers/users/dossiers_controller.rb

@@ -405,10 +405,6 @@ module Users
       @transfer = DossierTransfer.new(dossiers: [dossier])
     end
 
-    def transferer_all
-      @transfer = DossierTransfer.new(dossiers: current_user.dossiers)
-    end
-
     def restore
       dossier.restore(current_user)
       flash.notice = t('users.dossiers.restore')

app/views/users/dossiers/transferer_all.html.haml

@@ -1,7 +0,0 @@
-.container.mt-4
-  Transferer les #{@transfer.dossiers.size} dossiers de votre compte vers le compte d’un autre usager :
-
-  = form_for @transfer, url: transfers_path, html: { class: 'form mt-2' } do |f|
-    = f.label :email, 'Email du compte destinataire'
-    = f.email_field :email, required: true
-    = f.submit "Envoyer la demande de transfert", class: 'button primary'

config/routes.rb

@@ -390,7 +390,6 @@ Rails.application.routes.draw do
       end
 
       collection do
-        get 'transferer', to: 'dossiers#transferer_all'
         resources :transfers, only: [:create, :update, :destroy]
       end
     end