NIXL EP: add single sbatch support

[podkidyshev]

Summary

• Add single sbatch support for NIXL EP

Test Plan

• Automated CI
• Manual runs

Additional Notes

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ipod/nixlep-1sbatch

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