Enable async I/O tests with DS_DISABLE_REUSE_DIST_ENV
- Add DS_DISABLE_REUSE_DIST_ENV environment variable check to
tests/unit/common.py to allow disabling reuse_dist_env at runtime
- This prevents pool worker cleanup hangs that occur when distributed
environment is initialized in reused pool workers
- Update aws-torch-latest.yml and aws-torch-latest-full.yml:
- Mount /mnt/aio for O_DIRECT support (async I/O tests)
- Set DS_DISABLE_REUSE_DIST_ENV=1
- Add --basetemp=/mnt/aio to pytest commands
- Remove --ignore=unit/ops/aio (aio tests now enabled)
Signed-off-by: Masahiro Tanaka <mtanaka@anyscale.com>
