use localNode decorator for DCGM and Neuron metrics for host metadata

[movence]

Description:
For some edge cases, DCGM or Neuron metrics for ContainerInsights are missing host metadata labels including InstanceId and/or InstanceType. This PR is to use localNode decorator instead k8sDecorator to inject those host metadata while processing metrics.

Testing:
Tested on a test cluster to verify those metadata are still coming as part of DCGM/Neuron EMF logs (some sections have been redacted)

{
    "CloudWatchMetrics": [
        {
            "Namespace": "ContainerInsights",
            "Dimensions": [
                [
                    "ClusterName"
                ],
                [
                    "ClusterName",
                    "Namespace"
                ],
                [
                    "ClusterName",
                    "Namespace",
                    "PodName"
                ],
                [
                    "ClusterName",
                    "FullPodName",
                    "Namespace",
                    "PodName"
                ],
                [
                    "ClusterName",
                    "FullPodName",
                    "GpuDevice",
                    "Namespace",
                    "PodName"
                ]
            ],
            "Metrics": [
                {
                    "Name": "pod_gpu_power_draw",
                    "Unit": "None"
                },
                {
                    "Name": "pod_gpu_utilization",
                    "Unit": "Percent"
                },
                {
                    "Name": "pod_gpu_memory_utilization",
                    "Unit": "Percent"
                },
                {
                    "Name": "pod_gpu_memory_used",
                    "Unit": "Bytes"
                },
                {
                    "Name": "pod_gpu_memory_total",
                    "Unit": "Bytes"
                },
                {
                    "Name": "pod_gpu_temperature",
                    "Unit": "None"
                }
            ]
        }
    ],
    "ClusterName": "mixed-cluster",
    "FullPodName": "gpu-burn-6dcbd994fb-r6mxr",
    "GpuDevice": "nvidia0",
    "InstanceId": "i-0cc88415ec370ecf1",
    "InstanceType": "g4dn.12xlarge",
    "Namespace": "amazon-cloudwatch",
    "NodeName": "node",
    "PodName": "gpu-burn",
    "Sources": [
        "dcgm",
        "pod",
        "calculated"
    ],
    "Timestamp": "1729777653591",
    "Type": "PodGPU",
    "UUID": "uuid",
    "Version": "0",
    "kubernetes": {
        ...
    },
    "pod_gpu_memory_total": 16106127360,
    "pod_gpu_memory_used": 14272167936,
    "pod_gpu_memory_utilization": 90.1268,
    "pod_gpu_power_draw": 69.415,
    "pod_gpu_temperature": 34,
    "pod_gpu_utilization": 100
}

Documentation:

[jefchien]

Can we just remove them? They get overwritten in the localnode decorator like you said, so there isn't much use to them.