fix: move pnpm field from package.json to dedicated config file

[Solant]

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Latest commit: 30923b6

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[github-actions]

📊 Package size report

Package	Before	After
steiger-plugin-fsd	1634.65 KB	No change
steiger	61.25 KB	No change
toolkit	9.22 KB	No change

[pkg-pr-new]

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npm i https://pkg.pr.new/steiger@240

npm i https://pkg.pr.new/@feature-sliced/steiger-plugin@240

npm i https://pkg.pr.new/@steiger/toolkit@240

commit: a1285a6