Empties compute_config.node_pools when auto mode is disabled

When disabling auto mode, fixes the apply-time error:

```
│ Error: updating EKS Cluster (ex-eks-auto-mode) compute config: operation error EKS: UpdateClusterConfig, https response error StatusCode: 400, RequestID: f895a875-7bbf-4003-92e0-3aca4bc9d415, InvalidParameterException: When Compute Config nodeRoleArn is null or empty, nodePool list cannot be populated.
```

Author: lorengordon

main.tf

@@ -62,7 +62,7 @@ resource "aws_eks_cluster" "this" {
 
     content {
       enabled       = compute_config.value.enabled
-      node_pools    = compute_config.value.node_pools
+      node_pools    = compute_config.value.enabled ? compute_config.value.node_pools : []
       node_role_arn = compute_config.value.node_pools != null ? try(aws_iam_role.eks_auto[0].arn, compute_config.value.node_role_arn) : null
     }
   }