Merge pull request #7728 from apolcyn/clean_up_sanity_test

clean up sanity test

src/csharp/Grpc.Core.Tests/SanityTest.cs

@@ -58,8 +58,8 @@ namespace Grpc.Core.Tests
         [Test]
         public void TestsJsonUpToDate()
         {
-            Dictionary<string, List<string>> discoveredTests = DiscoverAllTestClasses();
+            var discoveredTests = DiscoverAllTestClasses();
-			Dictionary<string, List<string>> testsFromFile 
+            var testsFromFile 
                 = JsonConvert.DeserializeObject<Dictionary<string, List<string>>>(ReadTestsJson());
 
             Assert.AreEqual(discoveredTests, testsFromFile);