Add .NET client renames for Assessment/Rule resource trios (RESNAME001)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: abhi3047office

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

@@ -6,6 +6,8 @@ using Azure.ClientGenerator.Core;
 
 @@clientName(ProvisioningState, "BillingTrustProvisioningState", "csharp");
 @@clientName(Microsoft.BillingTrust, "BillingTrustMgmtClient", "python");
+@@clientName(Assessment, "BillingTrustAssessment", "csharp");
+@@clientName(Rule, "BillingTrustRule", "csharp");
 @@clientName(
   GenerateUploadTokenResponse,
   "GenerateUploadTokenResult",