Extract shared durable local-emulation kernel - #2496

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: aws-actions/aws-codebuild-run-build@4d15a47425739ac2296ba5e7eee3bdd4bfbdd767. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/