[AutoPR cognitiveservices/data-plane/QnAMaker] QnAMaker DTO changes for Multiturn#2449

AutorestCI merged 1 commit intorestapi_auto_cognitiveservices/data-plane/QnAMakerAzure/azure-sdk-for-js:restapi_auto_cognitiveservices/data-plane/QnAMakerfrom

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