automation: ReplaceContent should send and receive a RawFile

[tombuildsstuff]

Per the Swagger:

https://github.com/Azure/azure-rest-api-specs/blob/0b1805b3ce076549ba4e9285a4f0f8727caf53a5/specification/automation/resource-manager/Microsoft.Automation/stable/2022-08-08/runbook.json#L130-L136

Today we parse out:

namespace Pandora.Definitions.ResourceManager.Automation.v2022_08_08.RunbookDraft;

internal class ReplaceContentOperation : Operations.PutOperation
{
    public override string? ContentType() => "text/powershell";

    public override IEnumerable<HttpStatusCode> ExpectedStatusCodes() => new List<HttpStatusCode>
        {
                HttpStatusCode.Accepted,
                HttpStatusCode.OK,
        };

    public override bool LongRunning() => true;

    public override Type? RequestObject() => typeof(object);

    public override ResourceID? ResourceId() => new RunbookId();

    public override Type? ResponseObject() => typeof(CustomTypes.RawFile);

    public override string? UriSuffix() => "/draft/content";


}

However we should be both sending and receiving a RawFile type, to give us a consistent Marshal and Unmarshal function - so this is both a feature request for hashicorp/go-azure-sdk (to support these Marshal/Unmarshal funcs for RawFile's) and a bug in the Importer where we don't detect this is a RawFilepayload (instead we're outputting it as anobjectpayload), which whilst semantically the same means we can't rely on this being aRawFile`, which'll have other issues down the road.