[SPMD][BE] Remove deprecated aten.sym_numel branch (#99232)
Differential Revision: [](https://our.internmc.facebook.com/intern/diff/)
Differential Revision: [](https://our.internmc.facebook.com/intern/diff/)
Differential Revision: [](https://our.internmc.facebook.com/intern/diff/)
Differential Revision: [D45028732](https://our.internmc.facebook.com/intern/diff/D45028732)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99232
Approved by: https://github.com/yifuwang
