NVIDIA / gpu-operator / 36913395918

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feat: support metricRelabelings on the ServiceMonitor

ServiceMonitorConfig only exposed relabelings, which maps to Prometheus
target relabeling (Endpoint.RelabelConfigs) and runs before the scrape.
Rewriting labels on scraped samples, e.g. collapsing exported_namespace
back onto namespace, requires Endpoint.MetricRelabelConfigs and had no
API surface, so the Helm value was rejected by CRD validation.

Add MetricRelabelings to ServiceMonitorConfig and apply it on both
rendering paths: the ClusterPolicy controller and the DRA dcgm-exporter
manifest template. The DCGMExporterServiceMonitorConfig alias means the
field is available to the operator-metrics ServiceMonitor as well.

Fixes #2938

Signed-off-by: Gernot Seidler <gernot.seidler@hpe.com>

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