Auto merge of #131972 - klensy:FindFirstFileExW, r=ChrisDenton

speedup directory traversal on windows

Optimizes walking over dirs on windows by replacing `FindFirstFileW` with `FindFirstFileExW` with `FindExInfoBasic` option, that allows skipping filling unused struct field which should be faster.

Also adds the same change for fallback call of `FindFirstFileExW` in metadata call.

Locally shows small speedup, but bench results from other users are welcome.

Author: bors