[JIT] Add test for ignored class type property (#45233)

Summary:
Pull Request resolved: #45233

**Summary**
This commit modifies `TestClassType.test_properties` to check that
properties on class types can be ignored with the same syntax as
ignoring properties on `Modules`.

**Test Plan**
`python test/test_jit.py TestClassType.test_properties`

Test Plan: Imported from OSS

Reviewed By: ZolotukhinM

Differential Revision: D23971885

Pulled By: SplitInfinity

fbshipit-source-id: f2228f61fe26dff219024668cc0444a2baa8834c

test/jit/test_class_type.py

@@ -1167,13 +1167,19 @@ def free_function(x: int) -> int:
 
         @torch.jit.script
         class Properties(object):
+            __ignored_properties__ = ["unsupported"]
+
             def __init__(self, a: int):
                 self.a = a
 
             @property
             def attr(self) -> int:
                 return self.a - 1
 
+            @property
+            def unsupported(self) -> int:
+                return sum([self.a])
+
             @attr.setter
             def attr(self, value: int):
                 self.a = value + 3