chore: use pnpm shellEmulator instead of cross-env

[Rich-Harris]

see #14055 (comment)

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[benmccann]

Thanks @Rich-Harris! Looks like this is close, but the test failure seems legit:

test-basics@0.0.2-next.0 : test:cross-platform:dev packages\kit\test\apps\basics
  
  > test-basics@0.0.2-next.0 test:cross-platform:dev D:\a\kit\kit\packages\kit\test\apps\basics
  > node test/setup.js && node -e "fs.rmSync('test/errors.json', { force: true })" && DEV=true playwright test test/cross-platform/
  
  'DEV' is not recognized as an internal or external command,
  operable program or batch file.
  D:\a\kit\kit\packages\kit\test\apps\basics:
   ERR_PNPM_RECURSIVE_RUN_FIRST_FAIL  test-basics@0.0.2-next.0 test:cross-platform:dev: `node test/setup.js && node -e "fs.rmSync('test/errors.json', { force: true })" && DEV=true playwright test test/cross-platform/`
  Exit status 1

[Rich-Harris]

what the hell i thought this was literally the whole point of shellEmulator

[Rich-Harris]

emulating windows... more like hellEmulator amirite

[instantiatedwalrus]

Does shell-emulator work? https://github.com/pnpm/pnpm/blob/main/config/config/src/index.ts#L193

[benmccann]

Why remove it from pnpm-workspace.yaml? (c0b5120)

I did a code search on GitHub to find examples. rolldown seems to have it there: https://github.com/rolldown/rolldown/blob/b18419e92636fd33c4b3b885ab900f5b239177af/pnpm-workspace.yaml#L14

[benmccann]

y'all nerd sniped me. I spent way longer on this than intended. It looks like it's mostly working now except for some weird uvu CJS assertion. I sent a separate PR to finish migrating from uvu to vitest: #14145. Hopefully after that's merged we can rebase this PR and everything will be working