[AutoPR Microsoft.Azure.Management.MachineLearningServices] Update delete pe connection to long running#1498

openapi-sdkautomation[bot] wants to merge 2 commits intosdkAutomation/Microsoft.Azure.Management.MachineLearningServicesAzureSDKAutomation/azure-sdk-for-net:sdkAutomation/Microsoft.Azure.Management.MachineLearningServicesfrom

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