prometheus-kube-stack - support targetLabels for node-exporter and kubelet using operator

[kranthikirang]

Describe the bug a clear and concise description of what the bug is.

Currently we are not passing targetLabels to node-exporter serviceMonitor and also no way to create kubelet service with additional labels so that kubelet serviceMinotor can add them to targetLabels in prometheus.

Example:

`prometheus-node-exporter:
service:
labels:
cluster: talos-cluster
prometheus:
monitor:
targetLabels:
- cluster
relabelings:
- sourceLabels: [__meta_kubernetes_endpoint_node_name]
separator: ;
targetLabel: nodename
replacement: $1
action: replace

Where as same is supported in kube-service-metrics exporter.

kube-state-metrics:
customLabels:
cluster: talos-cluster
prometheus:
monitor:
targetLabels:
- cluster
relabelings:
- sourceLabels: [__meta_kubernetes_endpoint_node_name]
separator: ;
targetLabel: nodename
replacement: $1
action: replace`

What's your helm version?

version.BuildInfo{Version:"v3.16.2", GitCommit:"13654a52f7c70a143b1dd51416d633e1071faffb", GitTreeState:"clean", GoVersion:"go1.22.7"}

What's your kubectl version?

Client Version: v1.31.1 Kustomize Version: v5.4.2 Server Version: v1.31.1

Which chart?

kube-prometheus-stack

What's the chart version?

65.5.1

What happened?

No response

What you expected to happen?

No response

How to reproduce it?

No response

Enter the changed values of values.yaml?

No response

Enter the command that you execute and failing/misfunctioning.

helm upgrade -i prometheus . -n kube-system -f ./local/overrides.yaml

Anything else we need to know?

No response