Do not download slow test when on sandcastle (#57953)
Summary:
Downloading slow_test list on SC causes timeout, this is even a bigger issue since `common_utils.py` is reused in many internal projects/modules.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57953
Test Plan: CI
Reviewed By: janeyx99
Differential Revision: D28325527
fbshipit-source-id: ae47c9e43ad6f416008005bb26ceb2f3d6966f2e
Author
Rong Rong (AI Infra)
