Move to btn-confirm from btn-primary

for remaining stuff

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

@@ -13,7 +13,7 @@
           %p.mb-0
             %span= _('Try all GitLab has to offer for 30 days.')
             %span.d-none.d-sm-inline= _('No credit card required.')
-        = link_to _('Start your trial'), new_trial_registration_path(glm_source: 'gitlab.com', glm_content: 'gold-callout'), class: "btn btn-primary mt-2 mt-sm-0 #{button_css_class}", target: '_blank'
+        = link_to _('Start your trial'), new_trial_registration_path(glm_source: 'gitlab.com', glm_content: 'gold-callout'), class: "btn btn-confirm gl-button mt-2 mt-sm-0 #{button_css_class}", target: '_blank'
 
       - if is_dismissable
         %button.btn.btn-default.close.js-close{ type: 'button',

ee/spec/frontend/ee_trial_banner/ee_trial_banner_spec.js

@@ -19,7 +19,7 @@ describe('EE gitlab license banner dismiss', () => {
     setFixtures(`
     <div class="js-gitlab-ee-license-banner">
       <button class="js-close"></button>
-      <a href="#" class="btn gl-button btn-primary"></a>
+      <a href="#" class="btn gl-button btn-confirm"></a>
     </div>
     `);