Rework addressing code review feedback in smithy-rs#3859 (#3860)

## Motivation and Context

https://github.com/smithy-lang/smithy-rs/commit/1dbf37a5f4750f0a7833dca23a87a4ddf676b1e9
didn't address [code review
feedback](https://github.com/smithy-lang/smithy-rs/pull/3859#discussion_r1786751065)
correctly. This PR will fix it.

## Testing
Tests in CI

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