Handle Union types when creating call targets from pyrefly CallTarget

Reviewed By: arthaud

Differential Revision: D85703726

fbshipit-source-id: 2fe75ce8cd7a6c2e742f6da297c31279d453208e

Author: Tianhan Lu

source/interprocedural/test/callGraphTest.ml

@@ -2676,7 +2676,7 @@ let test_call_graph_of_define =
       (* TODO(T105570363): Resolve calls with mixed function and methods. *)
       labeled_test_case __FUNCTION__ __LINE__
       @@ assert_call_graph_of_define
-           ~_migrated_to_pyrefly:false
+           ~_migrated_to_pyrefly:true
            ~cmp:DefineCallGraphForTest.equal_ignoring_types
            ~source:
              {|
@@ -2749,7 +2749,7 @@ let test_call_graph_of_define =
       (* TODO(T105570363): Resolve calls with mixed function and constructors. *)
       labeled_test_case __FUNCTION__ __LINE__
       @@ assert_call_graph_of_define
-           ~_migrated_to_pyrefly:false
+           ~_migrated_to_pyrefly:true
            ~cmp:DefineCallGraphForTest.equal_ignoring_types
            ~source:
              {|