Remove deprecated torch.eig (#70982)
The time has come to remove deprecated linear algebra related functions. This PR removes `torch.eig`.
cc @jianyuh @nikitaved @pearu @mruberry @walterddr @IvanYashchuk @xwang233 @Lezcano
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70982
Approved by: https://github.com/Lezcano, https://github.com/malfet
