Make Service template table a gitlab-ui table

Also, fix a service template related spec.

app/views/admin/services/_form.html.haml

@@ -3,7 +3,7 @@
 %h3.page-title
   = @service.title
 
-%p #{@service.description} template.
+%p= @service.description
 
 = form_for :service, url: admin_application_settings_service_path, method: :put, html: { class: 'fieldset-form js-integration-settings-form' } do |form|
   = render 'shared/service_settings', form: form, integration: @service

app/views/admin/services/_service_templates_deprecated_alert.html.haml

@@ -5,4 +5,4 @@
   = sprite_icon('error', css_class: 'gl-alert-icon gl-alert-icon-no-title')
   %h4.gl-alert-title= _('Service templates are deprecated and will be removed in GitLab 14.0.')
   .gl-alert-body
-    = html_escape(s_("AdminSettings|You can't add new templates. To migrate or remove a Service template, create a new integration at %{settings_link_start}Settings &gt; Integrations%{link_end}. Learn more about %{doc_link_start}Project integration management%{link_end}.")) % { settings_link_start: settings_link_start, doc_link_start: doc_link_start, link_end: '</a>'.html_safe }
+    = html_escape_once(s_("AdminSettings|You can't add new templates. To migrate or remove a Service template, create a new integration at %{settings_link_start}Settings &gt; Integrations%{link_end}. Learn more about %{doc_link_start}Project integration management%{link_end}.")).html_safe % { settings_link_start: settings_link_start, doc_link_start: doc_link_start, link_end: '</a>'.html_safe }

app/views/admin/services/index.html.haml

@@ -5,10 +5,9 @@
 
 - if @activated_services.any?
   %h3.page-title Service templates
-  %p.light= s_('AdminSettings|Service template allows you to set default values for integrations')
+  %p= s_('AdminSettings|Service template allows you to set default values for integrations')
 
-  .table-holder
-    %table.table
+  %table.table.b-table.gl-table
     %colgroup
       %col
       %col

spec/features/admin/admin_settings_spec.rb

@@ -288,8 +288,6 @@ RSpec.describe 'Admin updates settings' do
       end
     end
 
-
-
     context 'Integration page', :js do
       before do
         visit integrations_admin_application_settings_path