Refactor to re-use existing methods

Instead of introducing new ones

app/helpers/services_helper.rb

 # frozen_string_literal: true
 
 module ServicesHelper
-  def service_form_url(service, project: nil)
-    if project.present?
-      project_service_path(project, service.to_param)
-    else
-      admin_application_settings_integration_path(service.to_param)
-    end
-  end
-
   def service_event_description(event)
     case event
     when "push", "push_events"
@@ -82,7 +74,7 @@ module ServicesHelper
 
   def scoped_integration_path(integration)
     if @project.present?
-      project_settings_integration_path(@project, integration)
+      project_service_path(@project, integration)
     elsif @group.present?
       group_settings_integration_path(@group, integration)
     else

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

@@ -10,7 +10,7 @@
     - if @service.respond_to?(:detailed_description)
       %p= @service.detailed_description
   .col-lg-9
-    = form_for(@service, as: :service, url: service_form_url(@service, project: @project), method: :put, html: { class: 'gl-show-field-errors integration-settings-form js-integration-settings-form', data: { 'can-test' => @service.can_test?, 'test-url' => test_project_service_path(@project, @service) } }) do |form|
+    = form_for(@service, as: :service, url: scoped_integration_path(@service), method: :put, html: { class: 'gl-show-field-errors 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, service: @service
       - if @service.editable?
         .footer-block.row-content-block

app/views/projects/services/alerts/_help.html.haml

 .js-alerts-service-settings{ data: { activated: @service.activated?.to_s,
-  form_path: service_form_url(@service, project: @project),
+  form_path: scoped_integration_path(@service),
   authorization_key: @service.token, url: @service.url, learn_more_url: 'https://docs.gitlab.com/ee/user/project/integrations/generic_alerts.html' } }