Handle zero-causal PrefixLM FA3 pass as no-op#13

Zane12518 wants to merge 2 commits into

sapientinc:mainsapientinc/HRM-Text:mainfrom

Zane12518:fix-fa3-zero-causal-noopZane12518/HRM-Text:fix-fa3-zero-causal-noopCopy head branch name to clipboard