support for flex-volumes in kubeadm. Users were advised to migrate away from flex-volumes as recommended by SIG Storage, since 1.22. If kubeadm users wish to continue using the feature, they would need a custom image for the KCM that is not based on distroless, pass the KCM flag `--flex-volume-plugin-dir` and mount the directory `/usr/libexec/kubernetes/kubelet-plugins/volume/exec` in the KCM static pod using kubeadm's `extraVolumes` mechanism before upgrading to 1.36. Up until now, kubeadm automatically...