@netlify/build-info throws EDUPLICATEWORKSPACE even with pnpm

[sapphi-red]

Describe the bug

getBuildInfo function in @netlify/build-info throws EDUPLICATEWORKSPACE when there is a duplicated workspace names.
Duplicated workspace names are not allowed by npm and yarn.
But it is supported by pnpm (pnpm/pnpm#5957).

I expect getBuildInfo function not to throw an error.

Steps to reproduce

1. Clone https://github.com/sapphi-red-repros/netlify-pnpm-cannot-iterate-over-repro
2. git switch build-info
3. pnpm i
4. node index.mjs

Configuration

[build.environment]
  NODE_VERSION = "16"
[build]
  publish = "packages/foo/.vitepress/dist"
  command = "pnpm build-foo"

Deploy logs

https://app.netlify.com/sites/dashing-marzipan-db6e0f/deploys/63ca28d308f3e100098fe2eb#L30

Here is the log, but it does not output any information that indicates that the error I described occurred. (netlify/build-image#898).

[lukasholzer]

It's fixed in a newer version (but this package is not ment to be used outside netlify)
The function getBuildInfo is currently not exported in version 6.5.0.

But you can call it via the CLI binary:

➜  netlify-pnpm-cannot-iterate-over-repro git:(build-info) ✗ pnpx @netlify/build-info
{
  "packageManager": {
    "name": "pnpm",
    "installCommand": "pnpm install",
    "runCommand": "pnpm run",
    "lockFile": "pnpm-lock.yaml",
    "forceEnvironment": "NETLIFY_USE_PNPM"
  },
  "jsWorkspaces": {
    "rootDir": "/Users/lukasholzer/Sites/monorepos/netlify-pnpm-cannot-iterate-over-repro",
    "isRoot": true,
    "packages": [
      "packages/bar1/duplicated",
      "packages/bar2/duplicated",
      "packages/foo"
    ]
  },
  "frameworks": [],
  "buildSystems": []
}