@aws-cdk/toolkit-lib: include NodejsFunction esbuild logs in ioHost notifications

### Describe the feature

When working with the new @aws-cdk/toolkit-lib and implementing a custom `ioHost` I'd like to have all the logs emitted by CDK included in the `notifiy` callback.

Right now this is not the case, and some logs like the one emitted by the `esbuild` bundling process are not included.

### Use Case

When using the new toolkit customers can control all the notifications and apply complex filtering/workflows on them. Right now the logs emitted by the bundling are excluded from these notifications and end up directly to stdout.

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.1000.2

### Environment details (OS name and version, etc.)

N/A