Add test case links to service ping e2e specs

qa/qa/specs/features/browser_ui/14_non_devops/service_ping_default_enabled_spec.rb

@@ -10,7 +10,7 @@ module QA
         Page::Admin::Menu.perform(&:go_to_metrics_and_profiling_settings)
       end
 
-      it 'has service ping toggle enabled' do
+      it 'has service ping toggle enabled', testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/348335' do
         Page::Admin::Settings::MetricsAndProfiling.perform do |setting|
           setting.expand_usage_statistics do |page|
             expect(page).not_to have_disabled_usage_data_checkbox

qa/qa/specs/features/browser_ui/14_non_devops/service_ping_disabled_spec.rb

@@ -10,7 +10,7 @@ module QA
         Page::Admin::Menu.perform(&:go_to_metrics_and_profiling_settings)
       end
 
-      it 'has service ping toggle is disabled' do
+      it 'has service ping toggle is disabled', testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/348340' do
         Page::Admin::Settings::MetricsAndProfiling.perform do |settings|
           settings.expand_usage_statistics do |usage_statistics|
             expect(usage_statistics).to have_disabled_usage_data_checkbox