Remove unnecessary [NoInterfaceObject] from testing IDL files

Source/build/scripts/templates/InternalSettingsGenerated.idl.tmpl

 {% from "macros.tmpl" import license -%}
 {{ license() }}
 
 [
     WillBeGarbageCollected,
-    NoInterfaceObject, // testing interfaces do not appear on global objects
 ] interface InternalSettingsGenerated {
 {%- for setting in settings if setting.type|to_idl_type %}
     void set{{setting.name|upper_first}}({{setting.type|to_idl_type}} {{setting.name}});
 {%- endfor %}
 };