[Bug]: Use POSIX for internal paths

[rtritto]

Self-service

• I'd be willing to implement a fix

Describe the bug

Paths, listed with yarn config --why, should not include the escape character.

Example:

Actual:

➤ YN0000: cacheFolder                   <internal>                   C:\\Users\\<USER>\\AppData\\Local\\Yarn\\Berry\\cache

Expected

➤ YN0000: cacheFolder                   <internal>                   C:/Users/<USER>/AppData/Local/Yarn/Berry/cache

To reproduce

• yarn init -y
• yarn set version canary
• yarn config --why

Environment

System:
  OS: Windows 11
Binaries:
  Node: 16.17.0
  Yarn: 4.0.0-rc.39

Additional context

No response