chore: more tests for pnpm workspace definitions

[danez]

I was investigating this issue changesets/changesets#1209 and started adding tests here to check if the issue is in manypkg. Turned out changeset is using an older version and get-packages is working correctly.

I'm not sure if you want, but might make sense to add these tests anyway.

[changeset-bot]

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Latest commit: b1f1fca

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