gh-116103: Prevent error in WindowsLoadTracker.__del__ on permission error (GH-116105)

gh-116103: Prevent error in WindowsLoadTracker.__del__ if there was a permission error
diff --git a/Lib/test/libregrtest/win_utils.py b/Lib/test/libregrtest/win_utils.py
index 5736cdf..b51fde0 100644
--- a/Lib/test/libregrtest/win_utils.py
+++ b/Lib/test/libregrtest/win_utils.py
@@ -24,6 +24,10 @@ class WindowsLoadTracker():
     """
 
     def __init__(self):
+        # make __del__ not fail if pre-flight test fails
+        self._running = None
+        self._stopped = None
+
         # Pre-flight test for access to the performance data;
         # `PermissionError` will be raised if not allowed
         winreg.QueryInfoKey(winreg.HKEY_PERFORMANCE_DATA)