Update Helm APIs to GA

[stefanprodan]

Changes:

• Update HelmRelease API to v2
• Update HelmRepository and HelmChart APIs to v1
• Use OCIRepository for kube-prometheus-stack
• Add chart_app_version and chart_ref_name labels to gotk_resource_info{customresource_kind="HelmRelease"}

Depends on: fluxcd/helm-controller#968
Part of: fluxcd/flux2#4712

[darkowlzz]

Did some manual testing and it looks good to me.

Highlighted the two new fields and revision for OCIRepository chart ref below:

gotk_resource_info{chart_app_version="v0.73.2", chart_name="kube-prometheus-stack", chart_ref_name="kube-prometheus-stack", container="kube-state-metrics", customresource_group="helm.toolkit.fluxcd.io", customresource_kind="HelmRelease", customresource_version="v2", endpoint="http", exported_namespace="monitoring", instance="10.244.0.40:8080", job="kube-state-metrics", name="kube-prometheus-stack", namespace="monitoring", pod="kube-prometheus-stack-kube-state-metrics-6cdcf846c8-6vxg2", ready="True", revision="58.5.1+18700a3db973", service="kube-prometheus-stack-kube-state-metrics"}