Refactor safe flatten (Azure#52187)

* refactor safe flatten

* Update eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/Visitors/SafeFlattenVisitor.cs

Co-authored-by: Copilot <[email protected]>

* handle nullable value type properly

* comment

---------

Co-authored-by: Copilot <[email protected]>

Author: live1206

eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/Utilities/PropertyHelpers.cs

@@ -12,6 +12,9 @@ namespace Azure.Generator.Management.Utilities
 {
     internal class PropertyHelpers
     {
+        public static bool IsOverriddenValueType(PropertyProvider innerProperty)
+            => innerProperty.Type.IsValueType && !innerProperty.Type.IsNullable;
+
         public static string GetCombinedPropertyName(PropertyProvider innerProperty, PropertyProvider immediateParentProperty)
         {
             var immediateParentPropertyName = GetPropertyName(immediateParentProperty);

eng/packages/http-client-csharp-mgmt/generator/Azure.Generator.Management/src/Visitors/SafeFlattenVisitor.cs

@@ -48,6 +48,8 @@ model BarSettingsResource is ProxyResource<BarSettingsProperties> {
   ...ResourceNameParameter<BarSettingsResource, SegmentName = "settings">;
 
   stringArray?: string[];
+  property: BarQuotaProperties;
+  anotherProperty: BarQuotaProperties;
 }
 
 @parentResource(Bar)
@@ -57,7 +59,7 @@ model BarQuotaResource is ProxyResource<BarQuotaProperties> {
 
 model BarQuotaProperties {
   /** enabled */
-  left: int16;
+  left: int32;
 }
 
 model BarSettingsProperties {