LibWeb: Make CSSRule and all its subclasses GC-allocated

Author: https://github.com/awesomekling
Commit: 12042f0757
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/CSS/CSSConditionRule.idl

@@ -1,6 +1,6 @@
 #import <CSS/CSSGroupingRule.idl>
 
-[Exposed=Window]
+[Exposed=Window, NoInstanceWrapper]
 interface CSSConditionRule : CSSGroupingRule {
     attribute CSSOMString conditionText;
 };