CSHARP-4238: Skip new integration tests on older servers.

Author: rstam

src/MongoDB.Driver.Core/Core/Misc/Feature.cs

@@ -59,6 +59,7 @@ public class Feature
         private static readonly Feature __createIndexesUsingInsertOperations = new Feature("CreateIndexesUsingInsertOperations", WireVersion.Zero, WireVersion.Server42);
         private static readonly Feature __csfle2 = new Feature("Csfle2", WireVersion.Server60);
         private static readonly Feature __currentOpCommand = new Feature("CurrentOpCommand", WireVersion.Server32);
+        private static readonly Feature __dateOperatorsNewIn50 = new Feature("DateOperatorsNewIn50", WireVersion.Server50);
         private static readonly Feature __densifyStage = new Feature("DensifyStage", WireVersion.Server51);
         private static readonly Feature __documentValidation = new Feature("DocumentValidation", WireVersion.Server32);
         private static readonly Feature __directConnectionSetting = new Feature("DirectConnectionSetting", WireVersion.Server44);
@@ -322,6 +323,11 @@ public class Feature
         [Obsolete("This property will be removed in a later release.")]
         public static Feature CurrentOpCommand => __currentOpCommand;
 
+        /// <summary>
+        /// Gets the date operators added in 5.0 feature.
+        /// </summary>
+        public static Feature DateOperatorsNewIn50 => __dateOperatorsNewIn50;
+
         /// <summary>
         /// Gets the aggregate $densify stage feature.
         /// </summary>