transfer : CopyStepDetailsProperty Wrong CloudFormation Mapping

### Describe the bug

AWS::Transfer::Workflow CopyStepDetails is generated with camel case. AWS API requires Properties in Pascal Case:

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-transfer-workflow-copystepdetails.html
{
"DestinationFileLocation" : S3FileLocation,
"Name" : String,
"OverwriteExisting" : String,
"SourceFileLocation" : String
}

Python code:

### Expected Behavior

Json Template output with pascal case properties

### Current Behavior

Json Template output with camel case properties.

### Reproduction Steps

`

copy_step_details_property = transfer.CfnWorkflow.CopyStepDetailsProperty(
destination_file_location=transfer.CfnWorkflow.S3FileLocationProperty(
s3_file_location=transfer.CfnWorkflow.S3InputFileLocationProperty(
bucket=bucket.bucket_name,
key="csv"
)
),
name=cp_to_s3,
overwrite_existing="TRUE",
source_file_location="${original.file}"
)

cfn_workflow = transfer.CfnWorkflow(
self,
"CopyToS3",
steps=[
transfer.CfnWorkflow.WorkflowStepProperty(
copy_step_details=copy_step_details_property
)
],
description='copy_to_s3'

)
`

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CDK CLI Version

2.110.0

### Framework Version

_No response_

### Node.js Version

v21.3.0

### OS

macOS Monterey Version 12.6

### Language

Python

### Language Version

Python (3.11)

### Other information

Start at the transfer.CfnWorkflow.CopyStepDetailsProperty entry point and reproduce the Python example to inspect the synthesized JSON. Compare its property names with the linked AWS CloudFormation documentation; done means DestinationFileLocation, Name, OverwriteExisting, and SourceFileLocation are emitted in PascalCase.

Written by the indexing model from the issue text.