Ensure C# script properties are added to the end

[raulsntos]

Follow-up to #54130
Closes #54414

Ensures that the get_property_list and get_script_property_list methods push the script properties to the end of the given list, this prevents the script property from appearing after the script variables.

In my previous PR I was assuming the list parameter came empty so using push_front directly was pushing the script properties in front of the script property, this PR uses a different list for the script properties and pushes them to the back at the end of the method like the GDScript implementation.

Before	After
[node name="MyNode" type="Node"] number = 42 script = ExtResource( 1 )	[node name="MyNode" type="Node"] script = ExtResource( 1 ) number = 42

[akien-mga]

Thanks!