Add control_plane_endpoints_config to gke examples

[mwarkentin]

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Description

The control_plane_endpoints_config option was recently added to google_container_cluster. It would be nice if the examples showed how to use it! It's a bit confusing particularly for "endpoint - (Output) The cluster's DNS endpoint." as that doesn't seem like something that is actually set by the user but an output instead.

The control_plane_endpoints_config block supports:
dns_endpoint_config - (Optional) DNS endpoint configuration.
The control_plane_endpoints_config.dns_endpoint_config block supports:
endpoint - (Output) The cluster's DNS endpoint.
allow_external_traffic - (Optional) Controls whether user traffic is allowed over this endpoint. Note that GCP-managed services may still use the endpoint even if this is false.

New or Affected Resource(s)

• google_container_cluster

Potential Terraform Configuration

N/A

References

• https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#nested_control_plane_endpoints_config
• https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#example-usage---with-a-separately-managed-node-pool-recommended
• https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#example-usage---with-the-default-node-pool

b/381887394

[rileykarson]

Note: We may want more thorough GKE examples in general, the current ones mostly cover the opinions Terraform has on node pool attachment and nothing else but basic configuration