Move from btn-success to btn-confirm in registrations directory

app/views/registrations/welcome/show.html.haml

@@ -25,4 +25,4 @@
             - if partial_exists? "registrations/welcome/button"
               = render "registrations/welcome/button"
             - else
-              = f.submit _('Get started!'), class: 'btn-success gl-button btn btn-block gl-mb-0 gl-p-3', data: { qa_selector: 'get_started_button' }
+              = f.submit _('Get started!'), class: 'btn-confirm gl-button btn btn-block gl-mb-0 gl-p-3', data: { qa_selector: 'get_started_button' }

changelogs/unreleased/btn-confirm-registrations.yml

+---
+title: Move from btn-success to btn-confirm in registrations directory
+merge_request: 56944
+author: Yogi (@yo)
+type: changed