Normalize trailing comma cases both for args and parameters

src/arguments/args-trailing-comma-multiple.case

src/arguments/args-trailing-comma-null.case

src/arguments/args-trailing-comma-single-args.case

src/arguments/args-trailing-comma-undefined.case

src/function-forms/dflt-params-trailing-comma.case

src/function-forms/params-trailing-comma-multiple.case

src/function-forms/params-trailing-comma-single.case

...unction-forms/rest-params-trailing-comma-early-error.case