run CI with torch nightly

[d4l3k]

This adds a new CI build that uses torch nightly to make sure we're compatible with trunk.

Nightly doesn't support old versions of glibc/CUDA driver so we needed to make a few upgrades to the runners.

This makes a few changes to CI for compatibility:

• update to linux_job_v2.yaml which uses a newer glibc
• use Python 3.12 since 3.10 has issues with the older glibc
• use CUDA 12.4 for the newer driver
• switch to g5.12xlarge (4 GPU A10G) which are compatible with newer CUDA version and can run all the multi GPU tests

Test plan:

CI

[H-Huang]

LGTM