[dotnet] Execute Selenium Manager commands without new window (#12593)

Execute Selenium Manager commands without new window

Co-authored-by: Diego Molina <diemol@users.noreply.github.com>

dotnet/src/webdriver/SeleniumManager.cs

@@ -143,6 +143,7 @@ private static Dictionary<string, object> RunCommand(string fileName, string arg
             process.StartInfo.FileName = binaryFullPath;
             process.StartInfo.Arguments = arguments;
             process.StartInfo.UseShellExecute = false;
+            process.StartInfo.CreateNoWindow = true;
             process.StartInfo.StandardErrorEncoding = Encoding.UTF8;
             process.StartInfo.StandardOutputEncoding = Encoding.UTF8;
             process.StartInfo.RedirectStandardOutput = true;