Update saml response alert

- use shared component

Changelog: other

EE: true

ee/app/views/groups/saml_providers/_response_debug.html.haml

 = bootstrap_form_for @saml_response_check.tap(&:valid?), url: '#', html: { class: 'gl-show-field-errors' } do |f|
   - if f.object.valid?
-    .gl-alert.gl-alert-success
-      .gl-alert-container
-        = sprite_icon('check-circle', css_class: 'gl-icon gl-alert-icon gl-alert-icon-no-title')
-        .gl-alert-content
+    = render 'shared/global_alert',
+      variant: :success do
       .gl-alert-body
         = s_('GroupSAML|Valid SAML Response')
   = f.errors_on :xml_response, hide_attribute_name: true