Revert "Actually functionalize torch.export (#101433)"
This reverts commit eec752ed056160ea848facfd19a19235e5f16e55.
Reverted https://github.com/pytorch/pytorch/pull/101433 on behalf of https://github.com/PaliC due to causing failures on functorch macOS tests ([comment](https://github.com/pytorch/pytorch/pull/101433#issuecomment-1550111671))
