Apply new GitLab UI for buttons on GitLab Import page

app/views/import/gitlab_projects/new.html.haml

@@ -20,5 +20,5 @@
         = file_field_tag :file, class: ''
   .row
     .form-actions.col-sm-12
-      = submit_tag _('Import project'), class: 'btn btn-success'
-      = link_to _('Cancel'), new_project_path, class: 'btn btn-cancel'
+      = submit_tag _('Import project'), class: 'gl-button btn btn-confirm'
+      = link_to _('Cancel'), new_project_path, class: 'gl-button btn btn-default btn-cancel'

changelogs/unreleased/gl-button-gl-import.yml

+---
+title: Apply new GitLab UI for buttons in GitLab Import page
+merge_request: 56095
+author: Yogi (@yo)
+type: changed