ensure all ee-specific admin settings panels remain open after form submission

ee/app/views/admin/application_settings/_custom_templates_form.html.haml

 - if ::Gitlab::CurrentSettings.custom_project_templates_enabled?
-  %section.settings.as-custom-project-templates.no-animate#js-mirror-settings{ class: ('expanded' if expanded) }
+  %section.settings.as-custom-project-templates.no-animate#js-custom-project-templates-settings{ class: ('expanded' if expanded) }
     .settings-header
       %h4
         = _('Custom project templates')
@@ -9,7 +9,7 @@
         = _('Select the custom project template source group.')
     .settings-content
 
-      = form_for @application_setting, url: admin_application_settings_path do |f|
+      = form_for @application_setting, url: admin_application_settings_path(anchor: 'js-custom-project-templates-settings') do |f|
         = form_errors(@application_setting)
 
         %fieldset

ee/app/views/admin/application_settings/_elasticsearch_form.html.haml

-= form_for @application_setting, url: admin_application_settings_path, html: { class: 'fieldset-form' } do |f|
+= form_for @application_setting, url: admin_application_settings_path(anchor: 'js-elasticsearch-settings'), html: { class: 'fieldset-form' } do |f|
   = form_errors(@application_setting)
 
   %fieldset

ee/app/views/admin/application_settings/_external_authorization_service_form.html.haml

-= form_for @application_setting, url: admin_application_settings_path, html: { class: 'fieldset-form' } do |f|
+= form_for @application_setting, url: admin_application_settings_path(anchor: 'js-external-auth-settings'), html: { class: 'fieldset-form' } do |f|
   = form_errors(@application_setting)
 
   %fieldset

ee/app/views/admin/application_settings/_geo.html.haml

-= form_for @application_setting, url: admin_application_settings_path, html: { class: 'fieldset-form' } do |f|
+= form_for @application_setting, url: admin_application_settings_path(anchor: 'js-geo-settings'), html: { class: 'fieldset-form' } do |f|
   = form_errors(@application_setting)
 
   %fieldset

ee/app/views/admin/application_settings/_pseudonymizer.html.haml

-= form_for @application_setting, url: admin_application_settings_path, html: { class: 'fieldset-form' } do |f|
+= form_for @application_setting, url: admin_application_settings_path(anchor: 'js-pseudonymizer-settings'), html: { class: 'fieldset-form' } do |f|
   = form_errors(@application_setting)
 
   %fieldset

ee/app/views/admin/application_settings/_slack.html.haml

-= form_for @application_setting, url: admin_application_settings_path, html: { class: 'fieldset-form' } do |f|
+= form_for @application_setting, url: admin_application_settings_path(anchor: 'js-slack-settings'), html: { class: 'fieldset-form' } do |f|
   = form_errors(@application_setting)
 
   %fieldset