models : fix the attn_factor for mistral3 graphs + improve consistency (#17945)
* models : fix the attn_factor for mistral3 graphs
* cont : rework attn_factor correction logic
* cont : make deepseek2 consistent
* cont : add TODO
* cont : special-case DSv2
* cont : revert Mistral 3 Large changes
* cont : fix DS2 to use the original attn_factor
* cont : minor comments