(dev-v2.6-archive) Rebase to new upstream at kube-prometheus-stack

The old upstream at https://github.com/helm/charts/tree/master/stable/prometheus-operator has been deprecated in favor of the chart at https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack.

This commit modifies the rancher-monitoring patch in order to rebase to this new upstream, so it contains a ton of different changes to the patch file.

Related Issue: rancher/rancher#28822

(partially cherry picked from commit 178528b12c)

packages/rancher-monitoring/package.yaml

@@ -1,4 +1,4 @@
-url: https://kubernetes-charts.storage.googleapis.com/prometheus-operator-8.16.1.tgz
+url: https://github.com/prometheus-community/helm-charts/releases/download/kube-prometheus-stack-9.4.2/kube-prometheus-stack-9.4.2.tgz
 packageVersion: 00
 generateCRDChart:
   enabled: true

packages/rio/charts/Chart.yaml

@@ -9,5 +9,4 @@ annotations:
   catalog.cattle.io/certified: rancher
   catalog.cattle.io/namespace: rio-system
   catalog.cattle.io/release-name: rio
-  catalog.cattle.io/experimental: true
-  catalog.cattle.io/requires-gvr: networking.istio.io.virtualservice/v1beta1
+  catalog.cattle.io/experimental: true

packages/rio/charts/README.md

@@ -12,7 +12,12 @@ See values.yaml for installation options.
 
 ## Prerequisites
 
-Rio requires Kubernetes 1.15 or newer cluster.
+1. Rio requires Kubernetes 1.15 or newer cluster.
+1. Helm installed in the cluster. If Tiller and its service account are not already installed run the following:
+    ```bash
+    $ kubectl apply -f helm/tiller-serviceaccount.yaml
+    $ helm init --service-account tiller
+    ```
 
 ## Installation
 

packages/rio/charts/helm/tiller-serviceaccount.yaml

@@ -0,0 +1,20 @@
+# This grants Helm/tiller the cluster admin role.
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: tiller
+  namespace: kube-system
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: tiller-cluster-rule
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: ServiceAccount
+  name: tiller
+  namespace: kube-system
+