[AutoPR @azure/arm-monitor] adding new api version 2021-05-01-preview#4812

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openapi-sdkautomation[bot] wants to merge 1 commit intomasterfrom sdkAuto/14485/@azure_arm-monitor

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Commits on Jun 15, 2021

CodeGen from PR 14485 in Azure/azure-rest-api-specs
SDKAuto
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