Previously we were downloading all of (eager311, dynamo38, dynamo311).
Now we just download what's necessary. This is useful for
update_failures.py because the dynamo tests finish much faster than the
eager tests and it only needs the result from the dynamo tests.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119027
Approved by: https://github.com/jamesjwu
ghstack dependencies: #118874, #118882, #118931