[WIP] Add vec256 test to linux CI (#44912)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44912
This is to add vec256 test into linux CI system.
The whole test will last 50 to 70 seconds.
Test Plan: Imported from OSS
Reviewed By: malfet
Differential Revision: D23772923
Pulled By: glaringlee
fbshipit-source-id: ef929b53f3ea7894abcd9510a8e0389979cab4a2
