use CancelRead when process does not exit on time, disable FileStream buffering

Author: adamsitnik

src/BenchmarkDotNet/Engines/AnonymousPipesHost.cs

@@ -24,7 +24,7 @@ public AnonymousPipesHost(string writHandle, string readHandle)
         }
 
         private Stream OpenAnonymousPipe(string fileHandle, FileAccess access)
-            => new FileStream(new SafeFileHandle(new IntPtr(int.Parse(fileHandle)), ownsHandle: true), access);
+            => new FileStream(new SafeFileHandle(new IntPtr(int.Parse(fileHandle)), ownsHandle: true), access, bufferSize: 1);
 
         public void Dispose()
         {

src/BenchmarkDotNet/Toolchains/DotNetCli/DotNetCliExecutor.cs

@@ -102,7 +102,7 @@ private ExecuteResult Execute(BenchmarkCase benchmarkCase,
                 {
                     logger.WriteLineInfo($"// The benchmarking process did not quit within {ExecuteParameters.ProcessExitTimeout.TotalSeconds} seconds, it's going to get force killed now.");
 
-                    processOutputReader.StopRead();
+                    processOutputReader.CancelRead();
                     consoleExitHandler.KillProcessTree();
                 }
                 else

src/BenchmarkDotNet/Toolchains/Executor.cs

@@ -83,7 +83,7 @@ private static ExecuteResult Execute(Process process, BenchmarkCase benchmarkCas
             {
                 logger.WriteLineInfo("// The benchmarking process did not quit on time, it's going to get force killed now.");
 
-                processOutputReader.StopRead();
+                processOutputReader.CancelRead();
                 consoleExitHandler.KillProcessTree();
             }
             else

src/BenchmarkDotNet/Toolchains/MonoWasm/WasmExecutor.cs

@@ -93,7 +93,7 @@ private static ExecuteResult Execute(Process process, BenchmarkCase benchmarkCas
             {
                 logger.WriteLineInfo("// The benchmarking process did not finish within 10 minutes, it's going to get force killed now.");
 
-                processOutputReader.StopRead();
+                processOutputReader.CancelRead();
                 consoleExitHandler.KillProcessTree();
             }
             else