Add validator integration tests · cartesi/rollups-node@f61ba82

The following actions use a deprecated Node.js version and will be forced to run on node20: viperproject/check-license-header@v2. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

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