Clean up test type dispatches (#14228)

Summary:

use expand decorator in test type dispatches

Reviewed By: DrJessop

Differential Revision: D82239681

Author: ethansfng

backends/cadence/aot/TARGETS

@@ -345,6 +345,7 @@ python_unittest(
     typing = True,
     deps = [
         ":ops_registrations",
+        ":typing_stubs",
         ":type_dispatch",
         "//caffe2:torch",
         "//executorch/backends/cadence/aot:graph_builder",