google_container_cluster should allow release_channel to be set to EXTENDED

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Description

GKE has added the Extended release channel. Doc link

We should update the terraform client to be able to set EXTENDED as an option for the release channel field.

New or Affected Resource(s)

• google_container_cluster

Potential Terraform Configuration

resource "google_container_cluster" "primary" {
  name     = "${var.project_id}-gke"
  location = var.region

  release_channel {
    channel = "EXTENDED"
  }
}

References

No response

[github-actions]

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