Backport changes from EE's GithubService integration

Adds detailed_status to pipeline hook data
Adds detailed_description option for Services
Integration edit page renders 404 if a service is disabled

app/controllers/projects/services_controller.rb

@@ -3,6 +3,7 @@ class Projects::ServicesController < Projects::ApplicationController
 
   # Authorize
   before_action :authorize_admin_project!
+  before_action :ensure_service_enabled
   before_action :service, only: [:edit, :update, :test]
 
   respond_to :html
@@ -54,4 +55,8 @@ class Projects::ServicesController < Projects::ApplicationController
   def service
     @service ||= @project.find_or_initialize_service(params[:id])
   end
+
+  def ensure_service_enabled
+    render_404 unless service
+  end
 end

app/views/projects/services/_form.html.haml

@@ -5,6 +5,9 @@
       = boolean_to_icon @service.activated?
 
     %p= @service.description
+
+    - if @service.respond_to?(:detailed_description)
+      %p= @service.detailed_description
   .col-lg-9
     = form_for(@service, as: :service, url: project_service_path(@project, @service.to_param), method: :put, html: { class: 'gl-show-field-errors form-horizontal integration-settings-form js-integration-settings-form', data: { 'can-test' => @service.can_test?, 'test-url' => test_project_service_path(@project, @service) } }) do |form|
       = render 'shared/service_settings', form: form, subject: @service

changelogs/unreleased/ce-jej-github-project-service-for-ci.yml

+---
+title: Hook data for pipelines includes detailed_status
+merge_request: 17607
+author:
+type: changed

lib/gitlab/data_builder/pipeline.rb

@@ -22,6 +22,7 @@ module Gitlab
           sha: pipeline.sha,
           before_sha: pipeline.before_sha,
           status: pipeline.status,
+          detailed_status: pipeline.detailed_status(nil).label,
           stages: pipeline.stages_names,
           created_at: pipeline.created_at,
           finished_at: pipeline.finished_at,

spec/lib/gitlab/data_builder/pipeline_spec.rb

@@ -26,6 +26,7 @@ describe Gitlab::DataBuilder::Pipeline do
     it { expect(attributes[:tag]).to eq(pipeline.tag) }
     it { expect(attributes[:id]).to eq(pipeline.id) }
     it { expect(attributes[:status]).to eq(pipeline.status) }
+    it { expect(attributes[:detailed_status]).to eq('passed') }
 
     it { expect(build_data).to be_a(Hash) }
     it { expect(build_data[:id]).to eq(build.id) }