test(protocoltests): enable request compression tests

[trivikr]

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Issue

Request compression was added in https://github.com/aws/aws-sdk-js-v3/pull/5643

Description

Enables protocoltests for request compression

Testing

CI

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[trivikr]

The SDKAppliedContentEncoding_ec2Query fails since 'Content-Encoding' header is populated, but 'content-encoding' is checked in the test file.

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