[Mistral3] Fix batched integration tests: padding_side=left + update expected values (#48161)
[Mistral3] Fix batched integration tests: set padding_side=left, update expected values
- Set `processor.tokenizer.padding_side = "left"` in both batched tests to fix
incorrect generation caused by right-padding with position ID tracking change
introduced in #43734. Right padding caused the model to ignore instructions.
- Update stale expected values for cuda sm_86 across all 3 integration tests,
verified on A10G (CUDA 8.6, torch 2.13).
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>