Enable Windows plugin tests (flutter#119345)

* Fix binary path

* Enable in presubmit

Author: stuartmorgan-g

.ci.yaml

@@ -4420,7 +4420,6 @@ targets:
       - .ci.yaml
 
   - name: Windows plugin_test_windows
-    bringup: true # New task
     recipe: devicelab/devicelab_drone
     timeout: 60
     properties:

dev/devicelab/lib/tasks/plugin_tests.dart

@@ -298,7 +298,7 @@ public class $pluginClass: NSObject, FlutterPlugin {
         break;
       case 'windows':
         if (await exec(
-          path.join(rootPath, 'build', 'windows', 'plugins', 'plugintest', 'Release', 'plugintest_plugin_test'),
+          path.join(rootPath, 'build', 'windows', 'plugins', 'plugintest', 'Release', 'plugintest_test.exe'),
           <String>[],
           canFail: true,
         ) != 0) {