Move torch::deploy tests to their own workflow job (#73676)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73676
For some reason https://github.com/pytorch/pytorch/pull/72637 ended up in getting messed up during rebasing so please refer to that pr for review history.
This PR creates a new workflow called ` deploy-linux-xenial-cuda11.3-py3.7-gcc7` for torch::deploy tests.
For testing go to https://www.torch-ci.com/pytorch/pytorch/pull/73676 and check if a build and test job occur with ` deploy-linux-xenial-cuda11.3-py3.7-gcc7`
Test Plan: Imported from OSS
Reviewed By: soulitzer
Differential Revision: D34586702
Pulled By: PaliC
fbshipit-source-id: 5627cf4ff411a4a04030f8b7726f84af979da213
(cherry picked from commit df6dddebb9fe078a6053a31033b5a40cc742fcf3)
