Automatic SDK generation not available for apps deployed via AWS CDK

When deploying a Chalice application using AWS CDK, the folder `.chalice\deployed` is not being populated as expected.

As a result, when attempting to retrieve the list of deployed resources and trigger the automatic SDK download process using the command `chalice generate-sdk --stage dev ./sdk`, the process is aborted with the following error message:

```
Could not find API ID, has this application been deployed?
Aborted!
```

Start by reproducing an AWS CDK deployment of a Chalice application and inspect whether .chalice\deployed is populated. Then run `chalice generate-sdk --stage dev ./sdk` and trace how it retrieves the API ID; done means deployed resources are available and automatic SDK generation completes successfully.

Written by the indexing model from the issue text.