test(k8s): finish P2-3 -- upgrade-path e2e + live cluster-secret regression gate - #763

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, azure/setup-helm@v4, helm/[email protected]. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/