Generated output-only types should use output-only subtypes

[maqiuyujoyce]

Checklist

• I did not find a related open enhancement request.
• I understand that enhancement requests filed in the GitHub repository are by default low priority.
• If this request is time-sensitive, I have submitted a corresponding issue with GCP support.

Describe the feature or resource

When I tried to generate the types for AlloyDBCluster using the following command:

go run main.go generate-types \
     --service google.cloud.alloydb.v1beta \
     --api-version "alloydb.cnrm.cloud.google.com/v1beta1" \
     --resource AlloyDBCluster:Cluster \
     --resource AlloyDBInstance:Instance

I found that the generated output-only type ClusterObservedState contains non-output-only subtypes like EncryptionInfo, though it also contains output-only subtypes like GeminiClusterConfigObservedState.

I'd expect the output-only types should use output-only subtypes instead of using non-output-only subtypes.

Additional information

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Importance

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