Remove helm sdk fork

[manno]

We want to bump helm and use upstream again. Fleet is currently using this fork: https://github.com/helm/helm/compare/main...rancher:v3.9.0-rancher1

There are several changes:

• warning for group readable kubeconfig file has been removed
• compile a static binary
• action/validate.go: adds forceAdopt option to skip the ownership check on resources to allow updating resources, which were not created by helm (?)
• action/validate.go: ignores errors for rancher cluster resources
• action/install.go: continues with the installation, even though the release is in PendingInstall
• kube clientt prints to stdout and doesn't use the logger