Fix Hyper-V Stop-VM to use TurnOff on timeout/failure

Author: vyadavmsft

lisa/tools/hyperv.py

@@ -273,9 +273,21 @@ def start_vm(
         if not is_ready:
             raise LisaException(f"VM {name} did not start")
 
-    def stop_vm(self, name: str) -> None:
-        # stop vm
-        self._run_hyperv_cmdlet("Stop-VM", f"-Name {name} -Force", force_run=True)
+    def stop_vm(self, name: str, is_graceful: bool = False) -> None:
+        """
+        Stop a Hyper-V VM.
+
+        Args:
+            name: VM name to stop
+            is_graceful: If True, attempts graceful shutdown with -Force.
+                        If False (default), performs immediate -TurnOff.
+        """
+        if is_graceful:
+            # Graceful shutdown (cleaner, but slower)
+            self._run_hyperv_cmdlet("Stop-VM", f"-Name {name} -Force", force_run=True)
+        else:
+            # Immediate power-off (fast, for recycling)
+            self._run_hyperv_cmdlet("Stop-VM", f"-Name {name} -TurnOff", force_run=True)
 
     def restart_vm(
         self,