Cannot `install_helm_client` while `get.helm.sh` is down.

## What would you like to be added
The installer hosted at `https://get.helm.sh` is currently unavailable: https://github.com/helm/helm/issues/31434.
This is preventing CI workflows from being able to perform any `helm` actions, ie: any k8s cluster management.

Could there be a backup procedure to handle such incidents more gracefully? Perhaps a secondary download url or `git clone`?

## Why is this needed
When `get.helm.sh` is down, our CI workflows unable to run, making it much harder and more error-prone to manage our production k8s deployments.

Start by locating the `install_helm_client` entry point and reviewing how it downloads from `https://get.helm.sh`. Compare possible fallback procedures, including a secondary download URL or `git clone`; done means CI workflows can perform Helm actions when the primary host is unavailable.

Written by the indexing model from the issue text.