[AutoPR @azure/eventgrid] Add Channel Archive Heartbeat event#6000

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openapi-sdkautomation[bot] wants to merge 1 commit intofeature/v4from sdkAuto/15885/@azure_eventgrid

+11,597-639

Commits on Sep 22, 2021

CodeGen from PR 15885 in Azure/azure-rest-api-specs
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