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[megatron] Enable Nemotron-3-Ultra-550B GRPO RL + fix multi-rank (EP>16/PP>2) weight sync#1816

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[megatron] Enable Nemotron-3-Ultra-550B GRPO RL + fix multi-rank (EP>16/PP>2) weight sync#1816
erictang000 wants to merge 3 commits into
NovaSky-AI:mainfrom
erictang000:nemotron-3-ultra-550b-rl

[megatron] Correct long-context/CP findings: CP composes with EP

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skyrl_gpu_tests
failed Jun 20, 2026 in 15s