Trees: Restore backward compatibility for file system based tree controllers (closes #20602)#20608

AndyButland merged 3 commits intomainumbraco/Umbraco-CMS:mainfrom

v16/bugfix/resolve-backward-compatibility-for-file-system-controllersumbraco/Umbraco-CMS:v16/bugfix/resolve-backward-compatibility-for-file-system-controllersCopy head branch name to clipboard