win_service - use custom binary for tests (#51689)

test/integration/targets/win_service/files/Program.cs

@@ -0,0 +1,16 @@
+using System.ServiceProcess;
+
+namespace SleepService
+{
+    internal static class Program
+    {
+        private static void Main(string[] args)
+        {
+            ServiceBase.Run(new ServiceBase[1]
+            {
+                (ServiceBase) new SleepService(args)
+            });
+        }
+    }
+}
+