Update azurerm_(linux|windows)_virtual_machine_scale_set - Fix #8454

[ArcturusZhang]

Partially fixes #8454

We could do this work around because the service team has confirmed that the default value when absence of this attribute is Regular (details here)

And the service cannot return anything when a property is not set in the request, they call this principal as "PUT-GET consistency".
In some circumstances, this helps - sometimes absence of a property means it was automatically assigned to a value chosen by Azure, and in this way, we will not be getting any diff, which is convenient. They usually will provide another operation to query the actual value of this. An example for this behaviour is the "managed boot diagnostics" here

[jackofallops]

Thanks @ArcturusZhang - This LGTM 👍

[ghost]

This has been released in version 2.57.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.57.0"
}
# ... other configuration ...

[github-actions]

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