Add .NET client rename for GenerateUploadTokenResponse (AZC0030) (#44398)

Co-authored-by: Abhinandan Mohan Raj <abmohanr@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

specification/billingtrust/resource-manager/Microsoft.BillingTrust/BillingTrust/client.tsp

@@ -5,3 +5,8 @@ using Microsoft.BillingTrust;
 using Azure.ClientGenerator.Core;
 
 @@clientName(ProvisioningState, "BillingTrustProvisioningState", "csharp");
+@@clientName(
+  GenerateUploadTokenResponse,
+  "GenerateUploadTokenResult",
+  "csharp"
+);