move //c10:tests target to the shared //c10/test package (#70928)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70928
ghstack-source-id: 148159366
Test Plan: Ensured that the same number of tests are found and run.
Reviewed By: malfet
Differential Revision: D33455272
fbshipit-source-id: fba1e3409b14794be3e6fe4445c56dd5361cfe9d
(cherry picked from commit b45fce500aa9c3f69915bf0857144ba6d268e649)
