[dotnet] tests should default to bidi disabled

Author: titusfortner

dotnet/test/common/Environment/DriverFactory.cs

@@ -67,7 +67,6 @@ public IWebDriver CreateDriverWithOptions(Type driverType, DriverOptions driverO
             {
                 browser = Browser.Chrome;
                 options = GetDriverOptions<ChromeOptions>(driverType, driverOptions);
-                options.UseWebSocketUrl = true;
 
                 var chromeOptions = (ChromeOptions)options;
                 chromeOptions.AddArguments("--no-sandbox", "--disable-dev-shm-usage");
@@ -185,6 +184,11 @@ protected void OnDriverLaunching(DriverService service, DriverOptions options)
                 options.ImplicitWaitTimeout = overriddenOptions.ImplicitWaitTimeout;
             }
 
+            if (System.Environment.GetEnvironmentVariable("WEBDRIVER_BIDI") == "true")
+            {
+                options.UseWebSocketUrl = true;
+            }
+
             return options;
         }