Add ability to attach node labels to all scrape jobs regardless of role

[bentonam]

Alloy discover.kubernetes has an attach_metadata{} block that can optionally include additional node information on discoveries that are not role="node" for example role="pod" this would also include all __meta_kubernetes_node labels and annotations.

Oftentimes we need to know the region, availability zone, node pool that a pod belongs in.

Proposal for each job in clusterMetrics: have a setting:

clusterMetrics:
  cadvisor:
    metricsTuning:
      nodeLabels: 
        # Whether or not to attach the node pool 
        nodepool: true
        # Whether or not to add the region
        region: true
        # Whether or not to add the availability_zone
        availability_zone: true