Add enable-workload-certificates for container_cluster resource

[sankit2020]

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Description

Add enable-workload-certificates for container_cluster resource

New or Affected Resource(s)

• google_container_cluster

Potential Terraform Configuration

Support --enable-workload-certificates in the google_container_cluster resource

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

https://buganizer.corp.google.com/issues/198206223

[sankit2020]

https://buganizer.corp.google.com/issues/198206223

[rileykarson]

Appears to have been closed in GoogleCloudPlatform/magic-modules#6328

[github-actions]

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