cdk.Arn.format: adds region automatically for services not requiring one

[mpuhacz]

Reproduction Steps

cdk.Arn.format({ service: "iam", resource: "role", resourceName: "*" }, this.props.serviceStack),

What did you expect to happen?

I expect Arn format method to skip region for services like IAM

What actually happened?

 0/3 | 10:47:56 AM | UPDATE_FAILED        | AWS::IAM::Policy                             | Pipeline/Pipeline/Integration/IntegrationCloudTest/Project/Role/DefaultPolicy (PipelineIntegrationIntegrationCloudTestProjectRoleDefaultPolicyCA2B5C47) IAM resource arn:aws:iam:us-east-1:1111111111111:role/* cannot contain region information. (Service: AmazonIdentityManagement; Status Code: 400; Error Code: MalformedPolicyDocument; 

Environment

• CDK CLI Version : 1.89.0
• Framework Version: 1.89.0
• Node.js Version: v14.14.0
• OS : OS X
• Language (Version): ts-node v9.1.1

Other

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This is 🐛 Bug Report

[rix0rrr]

Yeah. It doesn't have that knowledge though, and it's not a great place to encode that.

If you know you need to have no region, pass in region: ''.

[github-actions]

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