[AMORO-4295] AIP-5 Phase 3+4: idle-driven scale-down with graceful drain for dynamic allocation groups - #4296

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/labeler@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/