Default with object.__init__ or object.__new__ when cannot find definitions for init or new methods

Summary:
There seems no definition for `Exception.__init__` or `Exception.__new__` in
`builtins`. In this case, we should probably default to the `object.__init__`
or `object.__new__`.

Reviewed By: arthaud

Differential Revision: D85688232

fbshipit-source-id: d2f256be8efc175de7a5c86b1fd938222cce2162

Author: Tianhan Lu

source/interprocedural/test/callGraphTest.ml

@@ -2562,7 +2562,7 @@ let test_call_graph_of_define =
            ();
       labeled_test_case __FUNCTION__ __LINE__
       @@ assert_call_graph_of_define
-           ~_migrated_to_pyrefly:false
+           ~_migrated_to_pyrefly:true
            ~source:
              {|
      class C:
@@ -2586,7 +2586,7 @@ let test_call_graph_of_define =
            ();
       labeled_test_case __FUNCTION__ __LINE__
       @@ assert_call_graph_of_define
-           ~_migrated_to_pyrefly:false
+           ~_migrated_to_pyrefly:true
            ~source:
              {|
      def foo() -> None:
@@ -2624,7 +2624,7 @@ let test_call_graph_of_define =
            ();
       labeled_test_case __FUNCTION__ __LINE__
       @@ assert_call_graph_of_define
-           ~_migrated_to_pyrefly:false
+           ~_migrated_to_pyrefly:true
            ~source:
              {|
      def foo() -> None: