test(conversation): add missing auth input in e2e test

[atierian]

Problem

One of the E2E test cases for the conversation transformer doesn't include the newly introduced (and required) auth directive argument (https://github.com/aws-amplify/amplify-category-api/pull/3007).

Description of changes

Adds missing auth argument to E2E test case.

CDK / CloudFormation Parameters Changed

N/A

Issue #, if available

N/A

Description of how you validated changes

• E2E test run

Checklist

• [x] PR description included
• [x] yarn test passes
• [x] E2E test run linked
• [ ] ~Tests are changed or added~
• [ ] ~Relevant documentation is changed or added (and PR referenced)~
• [ ] ~New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies~
• [ ] ~Any CDK or CloudFormation parameter changes are called out explicitly~

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.