Issue #2949457 by idebr, jibran, Wim Leers, dungahk, fago, kim.pepper,...

Issue #2949457 by idebr, jibran, Wim Leers, dungahk, fago, kim.pepper, neclimdul, ravi.shankar, Suresh Prabhu Parkala, Sam152, joshua1234511, Kristen Pol, kualee, MiroslavBanov, acbramley, alexpott, Fabianx: Enhance Toolbar's subtree caching so that menu links with CSRF token do not need one subtree cache item per session

(cherry picked from commit f2669a31)