Self-hosted proving cluster k8s config

Note "self-hosted" here means a set of GPU-enabled machines, probably in GCS to start with, as opposed to a prover network like Succinct Prover Network.

This issue tracks the config to manage the instances. This doesn't include the services that run on those machines.

The issue provides no file or test names; begin by locating the repository's Kubernetes or infrastructure configuration for GPU-enabled machines and reviewing how cloud resources are managed. Keep the scope to configuration for the self-hosted proving cluster, excluding services running on those machines; done means the instances can be managed through that configuration.

Written by the indexing model from the issue text.