Update NCCL plugin to v1.0.3 in A3U

[akiki-liang0]

• update a3u slurm blueprints with NCCL plugin v1.0.3
• update NCCL env vars in NeMo example Dockerfile

Tests:

• 5 consecutive successful NCCL example runs
• 5 consecutive successful NeMo example runs
• 2 consecutive successful Ramble workload runs

Submission Checklist

NOTE: Community submissions can take up to 2 weeks to be reviewed.

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cluster Toolkit Contribution guidelines #

[tpdownes]

/gcbrun