fix: relabel job name for node-exporter

Author: henrywhitaker3

argo/cluster/monitoring/kube-prometheus-stack/chart/scrapeconfigs/node-exporter.yaml

@@ -21,3 +21,6 @@ spec:
         - 'mariadb-1.lab:9100'
         - 'mariadb-2.lab:9100'
   metricsPath: /metrics
+  relabelings:
+    - targetLabel: job
+      replacement: node_exporter