Add new step enable mirror via UI

ee/app/views/shared/_mirror_trigger_builds_setting.html.haml

@@ -4,7 +4,7 @@
 
 .form-check.gl-mb-3
   = f.check_box :mirror_trigger_builds, check_box_options.merge(class: "form-check-input")
-  = f.label :mirror_trigger_builds, _("Trigger pipelines for mirror updates"), class: "form-check-label"
+  = f.label :mirror_trigger_builds, _("Trigger pipelines for mirror updates"), class: "form-check-label", data: { qa_selector: 'mirror_trigger_builds_label' }
   .form-text.text-muted
     = _('Trigger pipelines when branches or tags are updated in the upstream repository. Depending on the activity of the upstream repository, this may greatly increase the load on your CI runners. Only enable this if you know they can handle the load.')
     %strong= _('CI will run using the credentials assigned above.')

qa/qa/ee/page/project/settings/mirroring_repositories.rb

@@ -24,8 +24,16 @@ module QA
                   element :updating_button
                   element :copy_public_key_button
                 end
+
+                view 'ee/app/views/shared/_mirror_trigger_builds_setting.html.haml' do
+                  element :mirror_trigger_builds_label
+                end
               end
             end
+
+            def select_mirror_trigger_option
+              click_element(:mirror_trigger_builds_label)
+            end
           end
         end
       end

qa/qa/specs/features/ee/browser_ui/4_verify/pipeline_for_project_mirror_github_spec.rb

@@ -5,7 +5,7 @@ require 'faker'
 require 'base64'
 
 module QA
-  context 'Verify', :github, :requires_admin, only: { subdomain: :staging }, quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/335045', type: :bug } do
+  context 'Verify', :github, :requires_admin, only: { subdomain: :staging } do
     include Support::Api
 
     describe 'Pipeline for project mirrors Github' do
@@ -44,7 +44,6 @@ module QA
         Flow::Login.sign_in(as: user)
         group.visit!
         import_project
-        Page::Project::Menu.perform(&:click_ci_cd_pipelines)
       end
 
       after do
@@ -54,6 +53,16 @@ module QA
       end
 
       it 'user commits to GitHub triggers CI pipeline', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/144' do
+        Page::Project::Menu.perform(&:go_to_repository_settings)
+        Page::Project::Settings::Repository.perform do |settings|
+          settings.expand_mirroring_repositories do |mirror_settings|
+            mirror_settings.repository_url = 'https://github.com/gitlab-qa-github/test-project.git'
+            mirror_settings.select_mirror_trigger_option
+            mirror_settings.mirror_repository
+          end
+        end
+
+        Page::Project::Menu.perform(&:click_ci_cd_pipelines)
         Page::Project::Pipeline::Index.perform do |index|
           expect(index).to have_no_pipeline, 'Expect to have NO pipeline before mirroring.'