* prevent `self.apply_chat_template` being applied for base Qwen models
* - added no chat template comparison in `test_chat_wrap_and_equivalence`
- removed duplicate comparison
* Revert "- added no chat template comparison in `test_chat_wrap_and_equivalence`"
This reverts commit 3a5ee8cfa1.
* Revert "prevent `self.apply_chat_template` being applied for base Qwen models"
This reverts commit df504397a8.
* copied `download_file` in `utils` from https://github.com/rasbt/reasoning-from-scratch/blob/main/reasoning_from_scratch/utils.py
* added copy of test `def test_tokenizer_equivalence()` from `reasoning-from-scratch` in `test_qwen3.py`
* removed duplicate code fragment in`test_chat_wrap_and_equivalence`
* use apply_chat_template
* add toggle for instruct model
* Update tokenizer usage
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Co-authored-by: rasbt <mail@sebastianraschka.com>
