[aws-lambda] add userNotFound property (#43915)

types/aws-lambda/test/cognito-tests.ts

@@ -57,6 +57,7 @@ const handler: CognitoUserPoolTriggerHandler = async (event, context, callback)
     str = event.request.challengeAnswer!;
     strOrUndefined = event.request.password;
     str = event.request.clientMetadata!['action'];
+    boolOrUndefined = event.request.userNotFound;
     boolOrUndefined = event.response.answerCorrect;
     strOrUndefined = event.response.smsMessage;
     strOrUndefined = event.response.emailMessage;

types/aws-lambda/trigger/cognito-user-pool-trigger.d.ts

@@ -67,6 +67,7 @@ export interface CognitoUserPoolTriggerEvent {
         challengeAnswer?: string;
         password?: string;
         clientMetadata?: { [key: string]: string };
+        userNotFound?: boolean;
     };
     response: {
         autoConfirmUser?: boolean;