Merge branch 'fix-google-tag-manager-nonce-value' into 'master'

Fix Google Tag Manager nonce value missing

See merge request gitlab-org/gitlab!76585

app/views/layouts/_google_tag_manager_head.html.haml

 - return unless google_tag_manager_enabled?
 
 - if Feature.enabled?(:gtm_nonce, type: :ops)
-  = javascript_tag do
+  = javascript_tag nonce: content_security_policy_nonce do
     :plain
       (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
       new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
       j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
-      'https://www.googletagmanager.com/gtm.js?id='+i+dl;var n=d.querySelector('[nonce]');
-      n&&j.setAttribute('nonce',n.nonce||n.getAttribute('nonce'));f.parentNode.insertBefore(j,f);
+      'https://www.googletagmanager.com/gtm.js?id='+i+dl;j.setAttribute('nonce',
+      '#{content_security_policy_nonce}');f.parentNode.insertBefore(j,f);
       })(window,document,'script','dataLayer','#{google_tag_manager_id}');
 - else
   = javascript_tag do