fix: add datasource regex to KPS dashboards to lock datasource selection

[AndrejsPon00]

Closes #638

[Copilot]

Pull request overview

This PR adds datasource regex configuration support to KPS (Kube Prometheus Stack) Grafana dashboards to enable locking datasource selection. The changes replace hardcoded empty regex values with templated values from Helm chart configuration.

Key changes:

• Added Helm template variable $Values at the start of each dashboard file
• Replaced hardcoded regex: "" with regex: {{ $Values.grafana.dashboard.datasource.regex | default "" }}
• Escaped Grafana template variables in legendFormat fields to prevent Helm template conflicts

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
kps-workload-total.yaml	Added datasource regex templating and escaped legend format variables
kps-scheduler.yaml	Added datasource regex templating and escaped legend format variables
kps-proxy.yaml	Added datasource regex templating and escaped legend format variables
kps-prometheus.yaml	Added datasource regex templating and escaped legend format variables
kps-pod-total.yaml	Added datasource regex templating
kps-persistentvolumesusage.yaml	Added datasource regex templating
kps-nodes.yaml	Added datasource regex templating and escaped legend format variables
kps-nodes-darwin.yaml	Added datasource regex templating and escaped legend format variables
kps-nodes-aix.yaml	Added datasource regex templating and escaped legend format variables
kps-node-rsrc-use.yaml	Added datasource regex templating and escaped legend format variables
kps-node-cluster-rsrc-use.yaml	Added datasource regex templating and escaped legend format variables
kps-namespace-by-workload.yaml	Added datasource regex templating
kps-namespace-by-pod.yaml	Added datasource regex templating
kps-kubelet.yaml	Added datasource regex templating and escaped legend format variables
kps-k8s-resources-workloads-namespace.yaml	Added datasource regex templating and escaped legend format variables
kps-k8s-resources-workload.yaml	Added datasource regex templating
kps-k8s-resources-pod.yaml	Added datasource regex templating
kps-k8s-resources-node.yaml	Added datasource regex templating and escaped legend format variables
kps-k8s-resources-namespace.yaml	Added datasource regex templating
kps-k8s-resources-multicluster.yaml	Added datasource regex templating
kps-k8s-resources-cluster.yaml	Added datasource regex templating
kps-k8s-coredns.yaml	Added datasource regex templating and escaped legend format variables
kps-grafana-overview.yaml	Added datasource regex templating and escaped legend format variables
kps-etcd.yaml	Added datasource regex templating and escaped legend format variables
kps-controller-manager.yaml	Added datasource regex templating and escaped legend format variables
kps-cluster-total.yaml	Added datasource regex templating
kps-apiserver.yaml	Added datasource regex templating and escaped legend format variables
kps-alertmanager-overview.yaml	Added datasource regex templating, escaped legend format variables, and cleaned up datasource current value