[iOS GPU] Add tests for RoIAlign (#60595)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60595
ghstack-source-id: 132245331
Test Plan: CI
Reviewed By: husthyc
Differential Revision: D29345400
fbshipit-source-id: 7406edee232a0ab7b40a4820e3ff9ac07871cdd4
