Fix spec name and refactor controller code

We can include IntegrationsHelper in the shared
IntegrationsActions to make the admin / group controllers
cleaner.

app/controllers/admin/integrations_controller.rb

@@ -2,7 +2,6 @@
 
 class Admin::IntegrationsController < Admin::ApplicationController
   include IntegrationsActions
-  include IntegrationsHelper
 
   before_action :not_found, unless: -> { instance_level_integrations? }
 

app/controllers/concerns/integrations_actions.rb

@@ -5,6 +5,7 @@ module IntegrationsActions
 
   included do
     include Integrations::Params
+    include IntegrationsHelper
 
     before_action :integration, only: [:edit, :update, :overrides, :test]
   end

app/controllers/groups/settings/integrations_controller.rb

@@ -4,7 +4,6 @@ module Groups
   module Settings
     class IntegrationsController < Groups::ApplicationController
       include IntegrationsActions
-      include IntegrationsHelper
 
       before_action :authorize_admin_group!
 

spec/controllers/admin/integrations_controller_spec.rb

@@ -108,7 +108,7 @@ RSpec.describe Admin::IntegrationsController do
       get :overrides, params: { id: instance_integration.class.to_param }, format: format
     end
 
-    context 'when format is HTML' do
+    context 'when format is JSON' do
       let(:format) { :json }
 
       include_context 'JSON response'