PMM-15441 Fit the pmm-ha CI install back onto the Kind node - #946

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/upload-artifact@v4, azure/setup-helm@v4.2.0, azure/setup-kubectl@v4, helm/kind-action@v1.10.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/