fix(middleware-serde): mark error entry non-enumerable

[AllanZhengYP]

Issue

Ref: D38831498

Description

The $response trait includes raw response for AWS service errors only. It's a low-risk that AWS service will include sensitive information in the error responses, but the possibility still exists.

This issue is scoped only with the logger, which means the logger should not print out the raw HTTP response for errors by default. This is because customer can access the raw HTTP response in variety of ways in the JavaScript SDK, we cannot prevent them from accessing potentially sensitive information.

This change makes the $response inenumerable makes sense here, so that the logger won't print the raw Http response by default. However, if customer need to access the raw Http response when handling the error, they can still access them specifically by error.$response.

Testing

Unit test

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