Add the ability to serialize enums values

src/ApiService/ApiService/OneFuzzTypes/Enums.cs

@@ -1,6 +1,9 @@
 using System.Collections.Concurrent;
+using Microsoft.OneFuzz.Service.OneFuzzLib.Orm;
 
 namespace Microsoft.OneFuzz.Service;
+
+[SerializeValue]
 public enum ErrorCode {
     INVALID_REQUEST = 450,
     INVALID_PERMISSION = 451,

src/ApiService/ApiService/TestHooks/NodeOperationsTestHooks.cs

@@ -268,7 +268,7 @@ public async Task<HttpResponseData> MarkTasksStoppedEarly([HttpTrigger(Authoriza
 
             var s = await req.ReadAsStringAsync();
             var markTasks = JsonSerializer.Deserialize<MarkTasks>(s!, EntityConverter.GetJsonSerializerOptions());
-            await _nodeOps.MarkTasksStoppedEarly(markTasks.node, markTasks.error);
+            await _nodeOps.MarkTasksStoppedEarly(markTasks!.node, markTasks.error);
 
             var resp = req.CreateResponse(HttpStatusCode.OK);
             return resp;

src/ApiService/ApiService/onefuzzlib/orm/CustomConverterFactory.cs

@@ -8,7 +8,7 @@
 namespace Microsoft.OneFuzz.Service.OneFuzzLib.Orm;
 
 public sealed class CustomEnumConverterFactory : JsonConverterFactory {
-    public override bool CanConvert(Type typeToConvert) => typeToConvert.IsEnum;
+    public override bool CanConvert(Type typeToConvert) => typeToConvert.IsEnum && (typeToConvert.GetCustomAttribute<SerializeValueAttribute>() == null);
 
     public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options) {
         object[]? knownValues = null;