iam: Role.customizeRoles should print the report to stdout

### Describe the feature

Currently when you use `Role.customizeRoles` the report is generated in a file within `cdk.out`. This is not very intuitive. We should log the human readable report to stdout and point them to `cdk.out` for the files (both human and machine readable).

### Use Case

It is currently confusing and not clear to the user where the report is located. It also doesn't make too much sense to have to go to a file to find the human readable report.

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.78.0

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

any

Start at the Role.customizeRoles entry point and trace how the human-readable and machine-readable reports are generated under cdk.out. Review the existing tests for this API, then verify that the human-readable report is printed to stdout while users are directed to the cdk.out files.

Written by the indexing model from the issue text.