Crossorgin attribute rendering added

app/views/layouts/_loading_hints.html.haml

 - if ActionController::Base.asset_host
   %link{ rel: 'dns-prefetch', href: ActionController::Base.asset_host }
   %link{ rel: 'preconnect', href: ActionController::Base.asset_host, crossorigin: '' }
-
 - if user_application_theme == 'gl-dark'
-  %link{ rel: 'preload', href: = stylesheet_url 'application_dark', as: 'style' }
+  %link{ { rel: 'preload', href: stylesheet_url('application_dark'), as: 'style' }, ActionController::Base.asset_host ? { crossorigin: '' } : {} }
 - else
-  %link{ rel: 'preload', href: = stylesheet_url 'application', as: 'style' }
-
-%link{ rel: 'preload', href: = stylesheet_url "highlight/themes/#{user_color_scheme}", as: 'style' }
-
+  %link{ { rel: 'preload', href: stylesheet_url('application'), as: 'style' }, ActionController::Base.asset_host ? { crossorigin: '' } : {} }
+%link{ { rel: 'preload', href: stylesheet_url("highlight/themes/#{user_color_scheme}"), as: 'style' }, ActionController::Base.asset_host ? { crossorigin: '' } : {} }
 - if Gitlab::CurrentSettings.snowplow_enabled? && Gitlab::CurrentSettings.snowplow_collector_hostname
   %link{ rel: 'preconnect', href: Gitlab::CurrentSettings.snowplow_collector_hostname, crossorigin: '' }