[AutoPR Microsoft.Azure.Management.Billing] Adding swagger to Microsoft.Billing 2020-05-01 for list billing account and billing profile reservations#3702

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openapi-sdkautomation[bot] wants to merge 1 commit intomasterfrom sdkAuto/13735/Microsoft.Azure.Management.Billing

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Commits on Mar 31, 2021

CodeGen from PR 13735 in Azure/azure-rest-api-specs
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