Use Pajamas alert in visibility and access settings

Use Pajamas alert component to display errors
shown when saving invalid values while updating
visibility and access settings.

Changelog: changed

app/views/admin/application_settings/_visibility_and_access.html.haml

 = gitlab_ui_form_for @application_setting, url: general_admin_application_settings_path(anchor: 'js-visibility-settings'), html: { class: 'fieldset-form', id: 'visibility-settings' } do |f|
-  = form_errors(@application_setting)
+  = form_errors(@application_setting, pajamas_alert: true)
 
   %fieldset
     = render 'shared/project_creation_levels', f: f, method: :default_project_creation, legend: s_('ProjectCreationLevel|Default project creation protection')