Enable a broken protocol test when fix is released in Smithy v1.51.0

[sichanyoo]

Background

Smithy's protocol test definition for RestJsonClientIgnoresDefaultValuesIfMemberValuesArePresentInResponse had an error in the expected value which was fixed here, but this won't be available until a new release of v1.51.0 that contains the fix is available.

For now this protocol test will stay disabled even after default value support work get merged (smithy-swift PR, aws-sdk-swift PR).

Enable the test once Smithy releases v1.51.0 and we start using that version.

[jbelkins]

Blocked while waiting for the next Smithy release.

[jbelkins]

Smithy 1.51 release is complete. Moving back to Todo.