Install TensorRT lib on oss docker and enable fx2trt unit test (#70203)
Summary:
CI
Lib installed and unit test run on https://github.com/pytorch/pytorch/actions/runs/1604076060
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70203
Reviewed By: janeyx99
Differential Revision: D33241684
Pulled By: wushirong
fbshipit-source-id: cd498908b00f3417bdeb5ede78f5576b3b71087c
