feat: update transform test script to update ManagedPolicyArn with partion

[xazhao]

Issue #, if available

The partition generated by the script is always aws
Now adding a new option to set partition to aws-cn or aws-us-gov based on the output path

Description of changes

Description of how you validated changes

Checklist

• Adheres to the development guidelines
• Add/update unit tests using:
  • Correct values
  • Bad/wrong values (None, empty, wrong type, length, etc.)
  • Intrinsic Functions
• Add/update integration tests
• Update documentation
• Verify transformed template deploys and application functions as expected
• Do these changes include any template validations?
  • Did the newly validated properties support intrinsics prior to adding the validations? (If unsure, please review Intrinsic Functions before proceeding).
    • Does the pull request ensure that intrinsics remain functional with the new validations?

Examples?

Please reach out in the comments, if you want to add an example. Examples will be
added to sam init through https://github.com/awslabs/aws-sam-cli-app-templates/

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

[GavinZZ]

I actually think it would be nice to have this by default.

[xazhao]

@GavinZZ There are some tests case which partition is hardcoded. In this case I don't want to have the script to update those arns.

[aaythapa]

Thank you for this 🙏

[hoffa]

@GavinZZ There are some tests case which partition is hardcoded. In this case I don't want to have the script to update those arns.

I agree with @GavinZZ, why not have this by default? This script is only used for new tests, so I don't see why the existing tests matter.