fs: ensure consistency for mkdtemp in both fs and fs/promises

Port changes for mkdtemp from lib/fs.js to lib/internal/fs/promise.js, ensuring consistent behavior. Refs: #51078 PR-URL: #53776 Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: LiviaMedeiros <[email protected]>

Author: YieldRay

lib/internal/fs/promises.js

@@ -1179,15 +1179,8 @@ async function mkdtemp(prefix, options){
 prefix=getValidatedPath(prefix,'prefix');
 warnOnNonPortableTemplate(prefix);
 
-letpath;
-if(typeofprefix==='string'){
-path=`${prefix}XXXXXX`;
-}else{
-path=Buffer.concat([prefix,Buffer.from('XXXXXX')]);
-}
-
 returnawaitPromisePrototypeThen(
-binding.mkdtemp(path,options.encoding,kUsePromises),
+binding.mkdtemp(prefix,options.encoding,kUsePromises),
 undefined,
 handleErrorFromBinding,
 );