Cryptic `WinError` reported when subprocess execution fails with WSL path

Based on the investigation below, the most pragmatic change we can make here is to enhance the exception handling around the _winapi.CreateProcess call in subprocess such that the reported WinError that is raised when the command given is on a WSL path at least reports the offending command (the way os.startfile already does).

Original bug report

ensurepip fails on Windows venv creation with WSL UNC path

Bug description:

Running Python 3.12.3 from the Windows Store via Windows PowerShell, attempting to create a Windows virtual environment under a WSL UNC path fails:

PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\fedoraremix\home\acoghlan\_build_win64> $windows_python="$((Get-Command python3).Path)"
PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\fedoraremix\home\acoghlan\_build_win64> & "$windows_python" --version
Python 3.12.3
PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\fedoraremix\home\acoghlan\_build_win64> & $windows_python -Im venv --copies test_venv
Error: [WinError 1] Incorrect function
PS Microsoft.PowerShell.Core\FileSystem::\\wsl$\fedoraremix\home\acoghlan\_build_win64> & $windows_python -Im venv --copies \\wsl$\fedoraremix\home\acoghlan\_build_win64\test_venv
Error: [WinError 1] Incorrect function

(I initially thought this might be related to #102584 , as it has some similarities to #102496, but there were enough differences that it seemed worthwhile to file a dedicated issue. The investigation below strongly supports the idea that this is a different problem, specifically with ensurepip trying to invoke a subprocess when sys.executable is pointing at an executable stored in a WSL folder)

CPython versions tested on:

3.12

Operating systems tested on:

Windows

Linked PRs

• gh-157713

Bắt đầu từ điểm vào của subprocess xung quanh lệnh gọi _winapi.CreateProcess và xem xét PR được liên kết gh-157713 để nắm hướng triển khai hiện tại. Công việc được xem là hoàn tất khi một lệnh bị lỗi trên đường dẫn WSL báo cáo lệnh gây ra lỗi cùng với WinError, và hành vi liên quan của subprocess được bao phủ bằng các bài kiểm thử.