Fix: Jamba batched generation
Author: vasqu
Pull request: yes

# What does this PR do?
Basically a continuation of #32677 which implements the fixes for Jamba this time. Batched generation tests might need to be changed, especially the logits, but not sure how to proceed there as the logits are HW dependent.  

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Comments:
CI failure seems unrelated to the PR, some import issues from another model.

Yea, I think it should definitely improve the batched generation. Especially since the `test_left_padding_compatibility` doesn't need higher atols anymore, padding is not as big of a problem as before (I think).

Too GPU poor to run the Jamba models, iirc they require at least an 80GB Vram GPU :cry: Maybe we could notify the guys behind Jamba? I doubt they are aware of this issue. 

#32250 seems to have changed the integration tests cc @gante 

Guess we have to redo them again :eyes: