[sbiscigl]

Description of changes:

When a service's model switches to smithy-rpc-v2-cbor, its exceptions with members beyond Message stop getting a GetModeledError specialization. Code that used to read those members now fails to link:

auto outcome = client.TranslateText(request);
// undefined reference to TranslateError::GetModeledError<TooManyTagsException>()
auto e = outcome.GetError().GetModeledError<Model::TooManyTagsException>();

This is a regression. Translate lost its 4 specializations in 1.11.908 and Shield lost its 4 in 1.11.927. 19 services are affected on main today.

Check all that applies:

• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
• Checked if this PR will not introduce cross-platform inconsistent behavior.
• Checked if this PR would require a ReadMe/Wiki update.

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