Update import manifest alert

- update to pajamas shared component

Changelog: other

app/views/import/shared/_errors.html.haml

 - if @errors.present?
-  .gl-alert.gl-alert-danger.gl-mb-5
-    .gl-alert-container
-      = sprite_icon('error', size: 16, css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
-      .gl-alert-content
+  = render 'shared/global_alert',
+    variant: :danger,
+    dismissible: false,
+    alert_class: 'gl-mb-5' do
     .gl-alert-body
       - @errors.each do |error|
         = error