[kube-prometheus-stack] Add orgId to the datasource values and configmap template.

[nscriptdotgo]

Is your feature request related to a problem ?

My orgId is 2, and grafana's default is 1. Every time I upgrade the helm chart, the datasource configmap sets the orgid back to 1 and I have to manually update the configmap.

Describe the solution you'd like.

I would like the configmap template to have a user-configured value so I and others can set the orgId to what is actually used.

Describe alternatives you've considered.

I have to manually update the configmap every time, not really a good workaround. I want to control all changes via helm.

Additional context.

No response