Merge branch '233658-migrate-alert-on-new-branch-page' into 'master'

Migrates the alert on the new branch page

See merge request gitlab-org/gitlab!50307

app/views/projects/branches/new.html.haml

@@ -2,8 +2,11 @@
 - default_ref = params[:ref] || @project.default_branch
 
 - if @error
-  .alert.alert-danger
-    %button.close{ type: "button", "data-dismiss" => "alert" } ×
+  .gl-alert.gl-alert-danger
+    = sprite_icon('error', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
+    %button.js-close.gl-alert-dismiss{ type: 'button', 'aria-label' => _('Dismiss') }
+      = sprite_icon('close', size: 16, css_class: 'gl-icon')
+    .gl-alert-body
       = @error
 %h3.page-title
   New Branch

changelogs/unreleased/233658-migrate-alert-on-new-branch-page.yml

+---
+title: Migrates the alert on the new branch page
+merge_request: 50307
+author:
+type: other