(stepfunctions_tasks): Setting the timeout on the Lambda function constructed by CallAwsServiceCrossRegion

### Describe the feature

When using the CallAwsServiceCrossRegion construct, it creates internally Lambda function. I have a use case, where the aws sdk call takes more than 30 seconds, but the timeout is hardcoded to 30 seconds.

### Use Case

Copying a large S3 file from one account to another

### 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

### AWS CDK Library version (aws-cdk-lib)

2.236.0

### AWS CDK CLI version

2.1104.0

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

Linux

Start by locating the CallAwsServiceCrossRegion construct and tracing where its internally created Lambda function receives the hardcoded timeout. Determine how a caller could configure that timeout, then verify the behavior for an AWS SDK call that takes longer than 30 seconds, such as copying a large S3 file across accounts.

Written by the indexing model from the issue text.