[aws-stepfunctions-task] misconfigured parition in the resourceArn of service integrations

[wqzoww]

When users create a Task state to call other AWS services, the partition in the "resourceArn" is hard-coded as "aws". This behavior causes trouble in Chinese regions where the partition is "aws-cn", rather than "aws".

With CDK, users can create their state machine correctly with "cdk deploy" but they can't start an execution properly with misconfigured ARN.

Reproduction Steps

See https://github.com/aws/aws-cdk/blob/master/packages/%40aws-cdk/aws-stepfunctions-tasks/test/publish-to-topic.test.ts#L19

Error Log

When users click on "Start execution" button on AWS Step Functions' console, they will get

{
  "error": "States.Runtime",
  "cause": "An error occurred while executing the state 'HelloWorld' (entered at the event id #2). The resource belongs to a different partition from the running execution."
}

Environment

• **CDK Version :1.13.1
• **OS : Mac 10.14.6
• **Language : Typescript

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This is 🐛 Bug Report