Adding xfail mark to test_LandscapeCanvas_GraphClosed_OnEntityDelete due to #2201 (#2208)

Signed-off-by: jckand-amzn <jckand@amazon.com>

AutomatedTesting/Gem/PythonTests/largeworlds/landscape_canvas/test_GeneralGraphFunctionality.py

@@ -104,6 +104,7 @@ class TestGeneralGraphFunctionality(object):
 
     @pytest.mark.test_case_id("C17488412")
     @pytest.mark.SUITE_periodic
+    @pytest.mark.xfail      # https://github.com/o3de/o3de/issues/2201
     def test_LandscapeCanvas_GraphClosed_OnEntityDelete(self, request, editor, level, launcher_platform):
         cfg_args = [level]