Add structured tracking to ultimate banner

- refs: #346644

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

 - is_dismissable = local_assigns.fetch(:is_dismissable, true)
 - callout = local_assigns.fetch(:callout, Users::CalloutsHelper::ULTIMATE_TRIAL)
 - button_css_class = is_dismissable ? 'mr-3' : ''
+- banner_title = 'ultimate_banner'
 
-.gl-display-none.gl-md-display-block.container-limited{ class: 'gl-pt-6! gl-pb-2!' }
+.gl-display-none.gl-md-display-block.container-limited{ class: 'gl-pt-6! gl-pb-2!', data: { track_action: 'render', track_label: banner_title } }
   .user-callout.promotion-callout.thin-callout.js-gold-trial-callout{ class: 'gl-mt-0!', data: { uid: 'trial_callout_dismissed', feature_id: callout, dismiss_endpoint: callouts_path } }
     .gl-card.gl-px-8.gl-py-6
       .gl-card-body.gl-display-flex{ class: 'gl-p-0!' }
@@ -13,7 +14,7 @@
           %p
             %span= _('Try all GitLab has to offer for 30 days.')
             %span.d-none.d-sm-inline= _('No credit card required.')
-          = link_to _('Start your free trial'), callouts_trials_link_url, class: "btn btn-confirm gl-button mt-2 mt-sm-0 #{button_css_class}", target: '_blank', rel: 'noopener noreferrer'
+          = link_to _('Start your free trial'), callouts_trials_link_url, class: "btn btn-confirm gl-button mt-2 mt-sm-0 #{button_css_class}", target: '_blank', rel: 'noopener noreferrer', data: { track_action: 'click_button', track_label: 'start_your_trial', track_property: banner_title }
         - if is_dismissable
-          %button.btn.gl-banner-close.btn-default.btn-sm.gl-button.btn-default-tertiary.btn-icon.close.js-close{ class: 'gl-opacity-10!', type: 'button', 'aria-label' => _('Dismiss trial promotion') }
+          %button.btn.gl-banner-close.btn-default.btn-sm.gl-button.btn-default-tertiary.btn-icon.close.js-close{ class: 'gl-opacity-10!', type: 'button', 'aria-label' => _('Dismiss trial promotion'), data: { track_action: 'dismiss_banner', track_label: banner_title } }
             = sprite_icon('close', css_class: 'dismiss-icon gl-text-gray-700!')

ee/spec/support/shared_examples/features/ultimate_trial_callout_shared_examples.rb

@@ -27,8 +27,17 @@
       visit page_path
 
       expect(page).to have_selector '.promotion-callout'
+      expect(page).to have_selector('[data-track-action=render]')
+      expect(page).to have_selector('[data-track-label=ultimate_banner]')
 
-      find('.promotion-callout .js-close').click
+      page.within('.promotion-callout') do
+        expect(page).to have_selector('[data-track-action=click_button]')
+        expect(page).to have_selector('[data-track-label=start_your_trial]')
+
+        expect(page).to have_selector('[data-track-action=dismiss_banner]')
+        expect(page).to have_selector('[data-track-label=ultimate_banner]')
+        find('.js-close').click
+      end
 
       expect(page).not_to have_selector '.promotion-callout'
     end