process: use validateString validator

Use the `validateString()` validator where applicable.
PR-URL: #41595
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: VoltrexKeyva

lib/internal/process/report.js

@@ -1,6 +1,5 @@
 'use strict';
 const{
-ERR_INVALID_ARG_TYPE,
 ERR_SYNTHETIC
 }=require('internal/errors').codes;
 const{
@@ -18,9 +17,11 @@ const report = {
 if(typeoffile==='object'&&file!==null){
 err=file;
 file=undefined;
-}elseif(file!==undefined&&typeoffile!=='string'){
-thrownewERR_INVALID_ARG_TYPE('file','String',file);
-}elseif(err===undefined){
+}elseif(file!==undefined){
+validateString(file,'file');
+}
+
+if(err===undefined){
 err=newERR_SYNTHETIC();
 }else{
 validateObject(err,'err');