ci: Shared node/pnpm action

[lachlancollins]

Inspired by:

• https://github.com/trpc/trpc/blob/next/.github/setup/action.yml
• https://github.com/pnpm/action-setup#use-cache-to-reduce-installation-time

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✅ Successfully ran 1 target

• nx run-many --targets=test:format,test:eslint,test:types,test:build

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