feat: Add attention_backend config support for Megatron policy#1628

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sahgerlad wants to merge 2 commits intoNVIDIA-NeMo:mainfrom

sahgerlad:feat/attention-backend-config

Commits on Dec 12, 2025

feat: Add attention_backend config support for Megatron policy
sahgerlad
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test: Add unit test for attention_backend config in Megatron policy
sahgerlad
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