[AI-FSSDK] [FSSDK-12418] Remove experiment type validation from config parsing (#402)

* [AI-FSSDK] [FSSDK-12418] Remove experiment type validation from config parsing

* [FSSDK-12423] dead code removal

---------

Co-authored-by: Md Junaed Hossain <169046794+junaed-optimizely@users.noreply.github.com>

Author: FarhanAnjum-opti

OptimizelySDK.Tests/ProjectConfigTest.cs

@@ -1736,6 +1736,19 @@ public void TestTypeFieldParsedCorrectly()
             Assert.AreEqual("fr", rolloutExperiment.Type);
         }
 
+        [Test]
+        public void TestUnknownExperimentTypeAccepted()
+        {
+            var datafile = BuildFeatureRolloutDatafile(experimentType: "new_unknown_type");
+            var config = DatafileProjectConfig.Create(datafile, LoggerMock.Object,
+                ErrorHandlerMock.Object);
+
+            Assert.IsNotNull(config);
+            var experiment = config.GetExperimentFromKey("rollout_experiment");
+            Assert.IsNotNull(experiment);
+            Assert.AreEqual("new_unknown_type", experiment.Type);
+        }
+
         #endregion
     }
 }

OptimizelySDK/Config/DatafileProjectConfig.cs

@@ -375,26 +375,8 @@ private void Initialize()
                 }
             }
 
-            var validExperimentTypes = new HashSet<string>
-            {
-                Experiment.EXPERIMENT_TYPE_AB,
-                Experiment.EXPERIMENT_TYPE_MAB,
-                Experiment.EXPERIMENT_TYPE_CMAB,
-                Experiment.EXPERIMENT_TYPE_TD,
-                Experiment.EXPERIMENT_TYPE_FR,
-            };
-
             foreach (var experiment in _ExperimentIdMap.Values)
             {
-                if (experiment.Type != null && !validExperimentTypes.Contains(experiment.Type))
-                {
-                    Logger.Log(LogLevel.ERROR,
-                        $@"Experiment ""{experiment.Key}"" has invalid type ""{experiment.Type}"".");
-                    ErrorHandler.HandleError(
-                        new InvalidExperimentException(
-                            $"Invalid experiment type: {experiment.Type}"));
-                }
-
                 _VariationKeyMap[experiment.Key] = new Dictionary<string, Variation>();
                 _VariationIdMap[experiment.Key] = new Dictionary<string, Variation>();
                 _VariationIdMapByExperimentId[experiment.Id] = new Dictionary<string, Variation>();

OptimizelySDK/Entity/Experiment.cs

@@ -23,10 +23,6 @@ public class Experiment : ExperimentCore
     {
         private const string MUTEX_GROUP_POLICY = "random";
 
-        public const string EXPERIMENT_TYPE_AB = "ab";
-        public const string EXPERIMENT_TYPE_MAB = "mab";
-        public const string EXPERIMENT_TYPE_CMAB = "cmab";
-        public const string EXPERIMENT_TYPE_TD = "td";
         public const string EXPERIMENT_TYPE_FR = "fr";
 
         /// <summary>