chore(core/protocols): make error lookup in runtime protocol consistent with existing codegen

[kuhe]

Issue

smithy-lang/smithy-typescript#1600

Description

prerelease fixes

• after parsing the error identifier in AWS Query runtime protocol, attempt a direct lookup of the error shape by name first, before checking for error shapes where the awsQueryError.Code matches the error identifier.
  • this is consistent with how MICG error deserialization would work once awsQueryCompat is enabled

Testing

passes the existing cloudwatch querycompat e2e test, and CI

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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