Avoid creation of tasks (#3282)

Author: Evangelink

src/Adapter/MSTest.TestAdapter/Execution/TestClassInfo.cs

@@ -384,8 +384,7 @@ internal UnitTestResult GetResultOrRunClassInitialize(ITestContext testContext,
 
             try
             {
-                var threadTask = Task.Run(entryPointThread.Join);
-                threadTask.Wait();
+                entryPointThread.Join();
                 return result;
             }
             catch (Exception ex)
@@ -667,8 +666,7 @@ internal void RunClassCleanup(ITestContext testContext, ClassCleanupManager clas
 
             try
             {
-                var threadTask = Task.Run(entryPointThread.Join);
-                threadTask.Wait();
+                entryPointThread.Join();
             }
             catch (Exception ex)
             {

src/Adapter/MSTest.TestAdapter/Execution/TestMethodRunner.cs

@@ -81,8 +81,7 @@ internal UnitTestResult[] Execute(string initializationLogs, string initializati
 
             try
             {
-                var threadTask = Task.Run(entryPointThread.Join);
-                threadTask.Wait();
+                entryPointThread.Join();
             }
             catch (Exception ex)
             {

src/Adapter/MSTest.TestAdapter/VSTestAdapter/MSTestExecutor.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using System.Runtime.InteropServices;