fix(aws-cloudfront-s3): support other partitions

[biffgaut]

In aws-cloudfront-s3, the partition is hardcoded to aws - https://github.com/awslabs/aws-solutions-constructs/blob/main/source/patterns/%40aws-solutions-constructs/aws-cloudfront-s3/lib/index.ts#L169

While CloudFront support across different partitions varies, there's no reason to limit this construct to a single partition - using the correct partition value here will ensure functionality as other partitions achieve feature parity.

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