show files attachments instead of file infos in API for acq.media release

spec/controllers/api/acquired_media_releases_controller_spec.rb

@@ -30,6 +30,16 @@ RSpec.describe Api::AcquiredMediaReleasesController, type: :controller do
 
       expect(response).to be_successful
     end
+
+    it 'contains files attachment data' do
+      tested_release = create(:acquired_media_release, name: 'ct1', project_id: project.id)
+
+      sign_in_to_api(current_user)
+      get :show, params: { id: tested_release.id }
+
+      expect(response.body).not_to match /file_infos/
+      expect(response.body).to match /files/
+    end
   end
 
   describe '#create' do