fix(msk-alpha): cluster deployment fails in ap-southeast-1

[rix0rrr]

The reason is that the AwsCustomResource that this construct library uses calls describeCluster, which passes back all responses to CloudFormation, even if they are unused.

This PR restricts the return value to only the outputs that are actually read.

Fixes #28108

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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).