HanaOnAzure: rename Display->HanaOnAzureOperationDisplay, HanaProvisioningStatesEnum->HanaProvisioningState (csharp)

Also use a using directive so csharp-scoped decorators reference models unqualified.

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

Author: cxznmhdcxz

specification/hanaonazure/resource-manager/Microsoft.HanaOnAzure/HanaOnAzure/client.tsp

@@ -2,15 +2,15 @@ import "@azure-tools/typespec-client-generator-core";
 import "./main.tsp";
 
 using Azure.ClientGenerator.Core;
+using Microsoft.HanaOnAzure;
 
 @@clientName(
   Microsoft.HanaOnAzure,
   "HanaManagementClient",
   "javascript,python"
 );
 
-@@clientName(
-  Microsoft.HanaOnAzure.ProviderInstanceProperties.properties,
+@@clientName(ProviderInstanceProperties.properties,
   "ProviderProperties",
   "csharp"
 );
@@ -21,8 +21,8 @@ using Azure.ClientGenerator.Core;
   "csharp"
 );
 
-@@clientName(
-  Microsoft.HanaOnAzure.Operation,
-  "HanaOnAzureOperationInfo",
-  "csharp"
-);
+@@clientName(Operation, "HanaOnAzureOperationInfo", "csharp");
+
+@@clientName(HanaProvisioningStatesEnum, "HanaProvisioningState", "csharp");
+
+@@clientName(Display, "HanaOnAzureOperationDisplay", "csharp");