[Bug] Property should be public if it is a polymorphism type because its fields can't be expanded fully

[BethanyZhou]

https://github.com/Azure/azure-rest-api-specs/blob/fda03acb3594cdd152e50146045adcf588b8c6cf/specification/recoveryservicesbackup/resource-manager/Microsoft.RecoveryServices/stable/2023-02-01/bms.json#L8724

Workaround:

• from: source-file-csharp
  where: $
  transform: $ = $.replace('internal Microsoft.Azure.PowerShell.Cmdlets.Kusto.Models.Api20221229.IDataConnection Property', 'public Microsoft.Azure.PowerShell.Cmdlets.Kusto.Models.Api20221229.IDataConnection Property');

[dolauli]

Fixed in autorest.powershell v4