[Search] Add missing property when cloning SearchOptions (#27582)

* Use reflection to clone `SearchOptions`
Copy all properties using reflection to alleviate missing some properties being copied

* Simplify code by using `PropertyInfo` efficiently

* Add a test for `SearchOptions` clone method

* Do not use reflection to copy over `SearchOptions` properties

sdk/search/Azure.Search.Documents/src/Options/SearchOptions.cs

@@ -334,6 +334,7 @@ private static void Copy(SearchOptions source, SearchOptions destination)
             destination.Select = source.Select;
             destination.SemanticConfigurationName = source.SemanticConfigurationName;
             destination.SemanticFields = source.SemanticFields;
+            destination.SessionId = source.SessionId;
             destination.Size = source.Size;
             destination.Skip = source.Skip;
         }

sdk/search/Azure.Search.Documents/tests/DocumentOperations/SearchTests.cs

@@ -1018,6 +1018,34 @@ await resources.GetQueryClient().SearchAsync<Hotel>(
                 ids);
         }
 
+        [Test]
+        public void SearchOptionsCanBeCopied()
+        {
+            SearchOptions source = new();
+
+            source.Facets = new List<string> { "facet1", "facet2" };
+            source.Filter = "searchFilter";
+            // source.IncludeTotalCount = null;
+            source.QueryCaptionHighlightEnabled = false;
+            // source.QueryType = null;
+            source.Select = null;
+            source.SessionId = "SessionId";
+            source.Size = 100;
+            source.Skip = null;
+
+            SearchOptions clonedSearchOptions = source.Clone();
+
+            CollectionAssert.AreEquivalent(source.Facets, clonedSearchOptions.Facets); // A non-null collection with multiple items
+            Assert.AreEqual(source.Filter, clonedSearchOptions.Filter); // A string value
+            Assert.IsNull(clonedSearchOptions.IncludeTotalCount); // An unset bool? value
+            Assert.AreEqual(source.QueryCaptionHighlightEnabled, clonedSearchOptions.QueryCaptionHighlightEnabled); // A bool? value
+            Assert.IsNull(source.QueryType); // An unset enum? value
+            Assert.IsNull(clonedSearchOptions.Select); // A `null` collection
+            Assert.AreEqual(source.SessionId, clonedSearchOptions.SessionId); // A string value
+            Assert.AreEqual(source.Size, clonedSearchOptions.Size); // An int? value
+            Assert.IsNull(clonedSearchOptions.Skip); // An int? value set as `null`
+        }
+
         /* TODO: Enable these Track 1 tests when we have support for index creation
         protected void TestCanSearchWithDateTimeInStaticModel()
         {