BatchFeature.to() supports non-tensor keys (#33918)
* Fix issue in oneformer preprocessing
* [run slow] oneformer
* [run_slow] oneformer
* Make the same fixes in DQA and object detection pipelines
* Fix BatchFeature.to() instead
* Revert pipeline-specific changes
* Add the same check in Pixtral's methods
* Add the same check in BatchEncoding
* make sure torch is imported
