enable_shielded_nodes is not sent for container cluster resource

[ScottSuarez]

When you specify enable_shielded_nodes on container cluster resource the value isn't being sent.

References

• b/187748032

[ScottSuarez]

terraform sdk has this thing where if a field is computed it wont't tell you if it exists in the config with getOk if the underlying value is falsey.. This seems like a problem where we rely on this behavior.
https://github.com/hashicorp/terraform-plugin-sdk/blob/main/helper/schema/resource_data.go#L85

ie b/187748032 runs into this issue because it tries to read if enable_shielded_nodes exists in the config first, but since the resource is computed and falsey it is never showing up.
https://github.com/hashicorp/terraform-provider-google-beta/blob/master/google-beta/resource_container_cluster.go#L1370

	if v, ok := d.GetOk("enable_shielded_nodes"); ok {

ok will always be false if computed is true and the value is falsey.

https://github.com/hashicorp/terraform-plugin-sdk/blame/main/helper/schema/resource_data.go#L94

so in this case terraform pretends that the value doesn't exist in the config.

[github-actions]

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