Add support for Dataplane V2 observability metrics

[jawnsy]

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Description

DataplaneV2 now exposes metrics: https://cloud.google.com/kubernetes-engine/docs/how-to/configure-dpv2-observability#enable-metrics-on-cluster

From the output of gcloud container clusters describe, it is part of the cluster's monitoringConfig:

monitoringConfig:
  advancedDatapathObservabilityConfig:
    enableMetrics: true
    relayMode: DISABLED

New or Affected Resource(s)

• google_container_cluster

https://registry.terraform.io/providers/hashicorp/google-beta/latest/docs/resources/container_cluster#nested_monitoring_config

Potential Terraform Configuration

# Propose what you think the configuration to take advantage of this feature should look like.
# We may not use it verbatim, but it's helpful in understanding your intent.

References

• 0000

• b/293780569

[toVersus]

I think this FR is already implemented by https://github.com/GoogleCloudPlatform/magic-modules/pull/8516 and has landed in terraform-provider-google v4.78.0.