Fix order of integrations to be sorted alphabetically

Integrations were previously sorted by SERVICE_NAMES
in service.rb which causes the gitlab_slack_application to
appear in the wrong order even though its title starts with
"S" since the old sort uses "G".

app/models/project.rb

@@ -1253,7 +1253,7 @@ class Project < ApplicationRecord
 
     available_services_names.map do |service_name|
       find_or_initialize_service(service_name)
-    end
+    end.sort_by(&:title)
   end
 
   def disabled_services

changelogs/unreleased/221136-docs-product-feedback-slack-notifications-service-doc-outdated.yml

+---
+title: Fix order of integrations to be sorted alphabetically
+merge_request: 34501
+author:
+type: fixed

spec/models/project_spec.rb

@@ -5227,13 +5227,13 @@ describe Project do
 
   describe '#find_or_initialize_services' do
     it 'returns only enabled services' do
-      allow(Service).to receive(:available_services_names).and_return(%w[prometheus pushover])
+      allow(Service).to receive(:available_services_names).and_return(%w[prometheus pushover teamcity])
       allow(subject).to receive(:disabled_services).and_return(%w[prometheus])
 
       services = subject.find_or_initialize_services
 
-      expect(services.count).to eq 1
-      expect(services).to include(PushoverService)
+      expect(services.count).to eq(2)
+      expect(services.map(&:title)).to eq(['JetBrains TeamCity CI', 'Pushover'])
     end
   end