Add unified logits_to_keep support to LLMClass
Author: hellopahe
Pull request: yes

# What does this PR do?

Add `logits_to_keep` arguments to `Glm4vForConditionalGeneration` and `Qwen2_5_VLForConditionalGeneration` class.


Fixes # (issue)
The `trl` repository now assumes that the Transformers library supports the `logits_to_keep` parameter starting from v4.49.0, since the required slicing step was removed in `grpo_trainer`. See the changes in [`grpo_trainer.py`](https://github.com/huggingface/trl/commit/b9572737b4796c6a72bacfd9ed78c686763725ea).

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Comments:
cc @qgallouedec @zucchini-nlp for TRL / VLMs

**[For maintainers]** Suggested jobs to run (before merge)

run-slow: glm4v, qwen2_5_vl

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