fs,win: fix readdir for named pipe

[huseyinacacak-janea]

This PR fixes the issue by giving the user the responsibility to add/remove trailing slashes for fs.readdir. Examples:

> require('fs').readdirSync('\\\\.\\pipe').length
Uncaught Error: ENOTDIR: not a directory, scandir '\\.\pipe'
    at Object.readdirSync (node:fs:1503:26) {
  errno: -4052,
  code: 'ENOTDIR',
  syscall: 'scandir',
  path: '\\\\.\\pipe'
}
> require('fs').readdirSync('\\\\.\\pipe\\').length
243

For additional context, most of the paths are resolved in resolve() in Node.js. This relies on normalizeString() which removes the trailing slashes. Since resolve() is widely used, any change in this function can cause many breaks as seen here.

Additionally, fs.readdir() internally relies on NtQueryDirectoryFile. This API doesn't allow us to use pipe paths without trailing slashes. On the other hand, fs.openSync() uses a different underlying API and works without trailing slashes in the physical drive paths. This difference highlights some inconsistencies across API functions, which seem to stem from the combined behaviors of libuv and the Windows API.

I'm open to suggestions.

cc: @Flarna

Fixes: #56002
Refs: #55623

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.99%. Comparing base (24a8662) to head (54534dd).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #56110      +/-   ##
==========================================
+ Coverage   87.97%   87.99%   +0.02%     
==========================================
  Files         656      656              
  Lines      188383   188982     +599     
  Branches    35973    35994      +21     
==========================================
+ Hits       165732   166297     +565     
- Misses      15821    15846      +25     
- Partials     6830     6839       +9     

Files with missing lines	Coverage Δ
src/node_file.cc	77.39% <ø> (+0.04%)	⬆️

... and 44 files with indirect coverage changes

[Flarna]

Verified locally that debugging using VsCode works. Seems VsCode already uses '\\\\.\\pipe\\'.

[Flarna]

@nodejs/path @nodejs/fs

Please take a look. Not sure if this is the right way to address the API inconsitencies. Also not sure if the previous PR (#55623) should be marked as SemverMajor because even after this fix behavior is slightly different.