[Bug] Some packages cause to fail finding .pnp.js in unicode path

• I'd be willing to implement a fix

Describe the bug

When you run yarn on the project with an unicode path, with this error message:

To Reproduce

{
  "dependencies": {
    "core-js": "^3.6.4"
  }
}

I couldn't find a way to reproduce the unicode path part using Sherlock, so please update this issue with automated test if available.

Screenshots

Expected behaviour	Current behaviour

• The username in the screenshot was redacted since it was my real name.

I attached the error log below.

# This file contains the result of Yarn building a package (core-js@npm:3.6.4)
# Script name: postinstall

internal/modules/cjs/loader.js:895
    throw err;
    ^

Error: Cannot find module 'C:\Users\����\Projects\reproducing-2\.pnp.js'
Require stack:
- internal/preload
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:892:15)
    at Function.Module._load (internal/modules/cjs/loader.js:785:27)
    at Module.require (internal/modules/cjs/loader.js:956:19)
    at Module._preloadModules (internal/modules/cjs/loader.js:1249:12)
    at loadPreloadModules (internal/bootstrap/pre_execution.js:437:5)
    at prepareMainThreadExecution (internal/bootstrap/pre_execution.js:63:3)
    at internal/main/eval_string.js:14:1 {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ 'internal/preload' ]
}

Environment if relevant (please complete the following information):

• OS: Microsoft Windows 10 Build 1909
• Node version v13.1.0
• Yarn version 2.0.0-rc.27

Additional context

For now I checked this error on these packages: core-js, core-js-pure, fsevents.

Start by reproducing yarn on Windows 10 in a path containing Unicode characters, using the provided core-js dependency and the listed Node and Yarn versions. Investigate how .pnp.js is found during package scripts, then add an automated regression test and verify that installation succeeds for the affected packages.