fix(ecs): remove accidental duplication of cloudmap namespaces with service connect

[bvtujo]

This PR should fix #25616, where service connect accidentally creates a duplicate HTTP namespace when a customer sets a service connect default namespace on the cluster.

Closes #25616

However, I think that a broader fix for this issue should include deprecation of the namespace parameter in ServiceConnectProps in favor of a cloudmapNamespace: INamespace parameter; that way, we can force resolution by ARN under the hood of the construct and never trigger the namespace duplication behavior.

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[gitpod-io]

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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).