add gke monitoring helm support. (#1600)

* fix gke monitoring.

* change to namespaced resources as much as possible.

* update helm chart readme.

* resolve nits.

* move autopilot to provider.gke.

Author: zetxqx

config/charts/inferencepool/values.yaml

@@ -50,7 +50,6 @@ inferenceExtension:
     # Prometheus ServiceMonitor will be created when enabled for EPP metrics collection
     prometheus:
       enabled: false
-    
     gke:
       enabled: false