[Bug]: When response is `string`, the final result from `getLroMetadata` is not correct.

[tadelesh]

Describe the bug

For the below playground, move async action has a string response as the final result. But we get ArmAcceptedLroResponse as the final result as well as the envelop result from getLroMetadata API.

Reproduction

Playground.

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.