[ao][fx] fixing public v private graph_module.py (#88395)
Summary: made _is_observed_module, _is_observed_standalone_module
private
Test Plan: python test/test_public_bindings.py
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: [D41015545](https://our.internmc.facebook.com/intern/diff/D41015545)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88395
Approved by: https://github.com/jcaip
