[lldb][windows] deactivate unicode tests on Windows (#181698)

#181143 introduced a regression
in Windows build bots, which is due to some Unicode characters not being
rendered properly.

The proper fix is to be able to configure the characters that are
rendered, and to force them to be ascii characters.

Author: charles-zablit

lldb/packages/Python/lldbsuite/test/decorators.py

@@ -452,6 +452,10 @@ def unicode_test(func):
     previous value afterwards.
     """
 
+    if sys.platform == "win32":
+        # Unicode support on Windows is flaky in CI.
+        return expectedFailureWindows
+
     def unicode_wrapped(*args, **kwargs):
         import os