Refactor examples to use scoped integrations

This change changes the examples to use a list of integrations
scoped to the context in which they are generated vs a hard coded
list.

spec/features/admin/integrations/instance_integrations_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Instance integrations', :js do
+  include_context 'instance integration activation'
+
+  it_behaves_like 'integration settings form' do
+    let(:integrations) { Integration.find_or_initialize_all_non_project_specific(Integration.for_instance) }
+
+    def navigate_to_integration(integration)
+      visit_instance_integration(integration.title)
+    end
+  end
+end

spec/features/groups/integrations/group_integrations_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Group integrations', :js do
+  include_context 'group integration activation'
+
+  it_behaves_like 'integration settings form' do
+    let(:integrations) { Integration.find_or_initialize_all_non_project_specific(Integration.for_group(group)) }
+
+    def navigate_to_integration(integration)
+      visit_group_integration(integration.title)
+    end
+  end
+end

spec/features/projects/integrations/project_integrations_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Project integrations', :js do
+  include_context 'project integration activation'
+
+  it_behaves_like 'integration settings form' do
+    let(:integrations) { project.find_or_initialize_integrations }
+
+    def navigate_to_integration(integration)
+      visit_project_integration(integration.title)
+    end
+  end
+end

spec/features/projects/integrations/integrations_settings_form_spec.rb → spec/support/shared_examples/integrations/integration_settings_form.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
-
-RSpec.describe 'Integrations settings form', :js do
+RSpec.shared_examples 'integration settings form' do
   include IntegrationsHelper
-  include_context 'project integration activation'
-
-  # Github integration is EE, so let's remove it here.
-  integration_names = Integration.available_integration_names - %w[github]
-  integrations = integration_names.map do |name|
-    Integration.integration_name_to_model(name).new
-  end
-
   # Note: these specs don't validate channel fields
   # which are present on a few integrations
-  integrations.each do |integration|
-    it "shows on #{integration.title}" do
-      visit_project_integration(integration.title)
+  it 'displays all the integrations' do
+    aggregate_failures do
+      integrations.each do |integration|
+        navigate_to_integration(integration)
 
-      aggregate_failures do
         page.within('form.integration-settings-form') do
           expect(page).to have_field('Active', type: 'checkbox', wait: 0),
                           "#{integration.title} active field not present"
@@ -43,6 +33,8 @@ RSpec.describe 'Integrations settings form', :js do
     end
   end
 
+  private
+
   def normalize_title(title, integration)
     return 'Merge request' if integration.is_a?(Integrations::Jira) && title == 'merge_request'