Support deploying lambda functions with custom CDK category

### Before opening, please confirm:

- [X] I have installed the latest version of the Amplify CLI (see above), and confirmed that the issue still persists.
- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-cli/issues?q=is%3Aissue+).
- [X] I have read the guide for [submitting bug reports](https://github.com/aws-amplify/amplify-cli/blob/master/CONTRIBUTING.md#bug-reports).
- [X] I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

### How did you install the Amplify CLI?

_No response_

### If applicable, what version of Node.js are you using?

_No response_

### Amplify CLI Version

7.4.5

### What operating system are you using?

Mac

### Amplify Categories

Not applicable

### Amplify Commands

push

### Describe the bug

Unable to deploy a lambda function via custom CDK stack through amplify. Same example works in a standalone CDK project. Error seems to imply that code assets are not built. I also don't see my function code zipped anywhere as CDK usually does.

### Expected behavior

Lambda function deployed.

### Reproduction steps

1. Add custom CDK category
2. Define lambda in CDK stack:

```
const fn = new lambda.Function(this, "fn", {
runtime: lambda.Runtime.NODEJS_14_X,
code: lambda.Code.fromAsset(`${cdkPath}/functions`),
handler: "hello",
});
```

3. amplify push

### GraphQL schema(s)

```graphql
# Put schemas below this line

```

### Log output

```
# Put your logs below this line

UPDATE_FAILED customcdk AWS::CloudFormation::Stack Tue Nov 23 2021 19:39:22 GMT+0100 (Central European Standard Time) Parameters: [AssetParametersc2d8a94782daaaf9412bb34f1a08f5e68ab8d9b98a7073fe0aac5317505259dcS3Bucket59FE5BCE, AssetParametersc2d8a94782daaaf9412bb34f1a08f5e68ab8d9b98a7073fe0aac5317505259dcS3VersionKeyC246F305, AssetParametersc2d8a94782daaaf9412bb34f1a08f5e68ab8d9b98a7073fe0aac5317505259dcArtifactHash2AAFE25B] must have values
```

### Additional information

_No response_