Failed to check LLM config existence: 'HTTPResponse' object has no attribute

Extension version 1.0.0b21.

Commands and output:
```
az aks agent-init -g foo --name bar

🚀 Welcome to AKS Agent initialization!

Please select the mode you want to use:
1. Cluster mode - Deploys agent as a pod in your AKS cluster
Uses service account and workload identity for secure access to cluster and Azure resources
2. Client mode - Runs agent locally using Docker
Uses your local Azure credentials and cluster user credentials for access

Enter your choice (1 or 2): 1

✅ Cluster mode selected. This will set up the agent deployment in your cluster.

Please specify the namespace where the agent will be deployed.

Enter namespace (e.g., 'kube-system'): my

📦 Using namespace: my
Unexpected error checking LLM config existence: 'HTTPResponse' object has no attribute 'getheaders'
❌ Error during initialization: Failed to check LLM config existence: 'HTTPResponse' object has no attribute
'getheaders'
Agent initialization failed: Failed to check LLM config existence: 'HTTPResponse' object has no attribute 'getheaders'
```