Merge branch '233693-remove-bootstrap-pages' into 'master'

Remove bootstrap from pages/form

Closes #233693

See merge request gitlab-org/gitlab!43442

app/views/projects/pages_domains/_form.html.haml

 - if domain_presenter.errors.any?
-  .alert.alert-danger
+  .gl-alert.gl-alert-danger
+    = sprite_icon('error', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
     - domain_presenter.errors.full_messages.each do |msg|
       = msg
 

changelogs/unreleased/233693-remove-bootstrap-pages.yml

+---
+title: Remove bootstrap from pages/form
+merge_request: 43442
+author:
+type: other