Revert "[export] Pickle result of export (#100423)"
This reverts commit 7226dbcbce87464fb170019a6ffeb80f82c37804.
Reverted https://github.com/pytorch/pytorch/pull/100423 on behalf of https://github.com/angelayi due to merge conflict ([comment](https://github.com/pytorch/pytorch/pull/100423#issuecomment-1534163373))
