Merge branch 'slashmanov/migrate-to-gl-alert-in-pages-domains-form' into 'master'

Migrate to GlAlert in Pages Domains form

See merge request gitlab-org/gitlab!83694

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

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