Revert "[export] Pickle of ExportGraphModule (#100620)"
This reverts commit d4975a5fe0b263087c8f060409a9331a1dbdde76.
Reverted https://github.com/pytorch/pytorch/pull/100620 on behalf of https://github.com/clee2000 due to broke export/test_serialize.py::TestSerialize::test_pickle_dynamic across various jobs https://hud.pytorch.org/pytorch/pytorch/commit/d4975a5fe0b263087c8f060409a9331a1dbdde76, i think you hit another landrace? ([comment](https://github.com/pytorch/pytorch/pull/100620#issuecomment-1536643519))
