fix(stepfunctions-tasks): properly serialize CallAwsServiceCrossRegion Lambda responses

[alvazjor]

Issue # (if applicable)

Closes #34768

Reason for this change

The handler in cross-region-aws-sdk-handler/index.ts file was not incorrectly returning byte-array as the payload when the called service was AWS Lambda. More details in the issue itself.

Description of changes

The handler now checks the response to identify if it is a byte-array or other type of binary data and parses it correctly into a string, which is the expected format

Describe any new or updated permissions being added

NA

Description of how you validated changes

Integ test added and unit tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[ozelalisen]

Overall LGTM, but security guardian is failing, could you have a look on that?

[alvazjor]

@ozelalisen Security Guardian is complaining about a test that has a role with too broad permissions. The test itself was not modified, is an old test that gives too broad permissions which makes sec guardian to mark it. If we want, we can fix it as a follow up, is not related to the current fix.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4042938
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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