Enable cpp api test in multigpu-test.sh (#23380)
Summary:
blocking https://github.com/pytorch/pytorch/issues/20995
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23380
Differential Revision: D16517013
Pulled By: mrshenli
fbshipit-source-id: 3f44ecf0e8d1e235165f2ce4396795ca38e2d837
