Use snowplow helper for track panel type specs

spec/lib/gitlab/metrics/dashboard/stages/track_panel_type_spec.rb

@@ -8,20 +8,19 @@ RSpec.describe Gitlab::Metrics::Dashboard::Stages::TrackPanelType do
   let(:project) { build_stubbed(:project) }
   let(:environment) { build_stubbed(:environment, project: project) }
 
-  describe '#transform!' do
+  describe '#transform!', :snowplow do
     subject { described_class.new(project, dashboard, environment: environment) }
 
     let(:dashboard) { load_sample_dashboard.deep_symbolize_keys }
 
     it 'creates tracking event' do
-      stub_application_setting(snowplow_enabled: true, snowplow_collector_hostname: 'localhost')
-      allow(Gitlab::Tracking).to receive(:event).and_call_original
-
       subject.transform!
 
-      expect(Gitlab::Tracking).to have_received(:event)
-        .with('MetricsDashboard::Chart', 'chart_rendered', { label: 'area-chart' })
-        .at_least(:once)
+      expect_snowplow_event(
+        category: 'MetricsDashboard::Chart',
+        action: 'chart_rendered',
+        label: 'area-chart'
+      )
     end
   end
 end