Remove `requests` code (#42845)
* setup, workflow and utils files
* src core files
* use get_session instead of httpx
* fix code quality - remove unused imports
* utils and prevous-http-used and cli
* style changes
* use httpx for non-HF images
* get_session for HF images
* change docstrings
* revert formatting - 1
* revert formatting - 2
* docstrings fixes
* revert formatting - 3
* docstring fixes
* fix failing test
* Update src/transformers/pipelines/image_to_image.py
* Update src/transformers/testing_utils.py
* fix modular generation check
* fix consistency
* Apply suggestions from code review
* Update src/transformers/models/idefics2/modeling_idefics2.py
* Update src/transformers/models/idefics3/modeling_idefics3.py
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Co-authored-by: Lucain <lucainp@gmail.com>
