Simplify call to Task.Run

We don't need to await the call to `ConnectAsync` in the async lambda passed to `Task.Run`. Instead we can just have a lambda that returns the same `Task` returned by `ConnectAsync` and `Task.Run` will do the right thing.

src/Compilers/Shared/BuildServerConnection.cs

@@ -345,7 +345,7 @@ internal static bool IsCompilerServerSupported(string tempPath)
                     // To avoid this, we first force ourselves to a background thread using Task.Run.
                     // This ensures that the Task created by ConnectAsync will run on the default
                     // TaskScheduler (i.e., on a threadpool thread) which was the intent all along.
-                    await Task.Run(async () => await pipeStream.ConnectAsync(timeoutMs, cancellationToken).ConfigureAwait(false)).ConfigureAwait(false);
+                    await Task.Run(() => pipeStream.ConnectAsync(timeoutMs, cancellationToken)).ConfigureAwait(false);
                 }
                 catch (Exception e) when (e is IOException || e is TimeoutException)
                 {