Add naming operation for Horizon DB onboarding (#43784)

Author: nasc17

specification/horizondb/resource-manager/Microsoft.HorizonDb/HorizonDb/client.tsp

@@ -139,7 +139,7 @@ using Azure.ClientGenerator.Core;
 );
 @@clientName(
   Microsoft.HorizonDb.HorizonDbReplicaForPatchUpdate,
-  "HorizonDBReplicaForPatchUpdate",
+  "HorizonDBReplicaPatch",
   "csharp"
 );
 @@clientName(
@@ -189,6 +189,11 @@ using Azure.ClientGenerator.Core;
   "HorizonDBPrivateEndpointConnectionProperties",
   "csharp"
 );
+@@clientName(
+  Azure.ResourceManager.PrivateEndpointConnectionUpdate.properties,
+  "HorizonDBPrivateEndpointConnectionPatchProperties",
+  "csharp"
+);
 @@clientName(
   Microsoft.HorizonDb.HorizonDbClusterParameterGroupConnectionProperties.applyImmediately,
   "ShouldApplyImmediately",