Move the `objects` method to `LfsHelper` so that it is also available to `LfsStorageController`

It is needed for the `lfs_check_access!` callback when the repository size limit is enabled (EE only).

app/controllers/projects/lfs_api_controller.rb

@@ -31,10 +31,6 @@ class Projects::LfsApiController < Projects::GitHttpClientController
 
   private
 
-  def objects
-    @objects ||= (params[:objects] || []).to_a
-  end
-
   def existing_oids
     @existing_oids ||= begin
       storage_project.lfs_objects.where(oid: objects.map { |o| o['oid'].to_s }).pluck(:oid)

app/helpers/lfs_helper.rb

@@ -30,6 +30,10 @@ module LfsHelper
     ci? || lfs_deploy_token? || user_can_download_code? || build_can_download_code?
   end
 
+  def objects
+    @objects ||= (params[:objects] || []).to_a
+  end
+
   def user_can_download_code?
     has_authentication_ability?(:download_code) && can?(user, :download_code, project)
   end