Accept processor in get_training_chat_template

[qgallouedec]

get_training_chat_template already works on both PreTrainedTokenizer and ProcessorMixin. The type hint, parameter name, and docstring were misleading by saying "tokenizer" only. Call sites (e.g. GRPOTrainer, SFTTrainer) already pass processing_class.

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Note

Low Risk
Mostly an API/typing/doc clarification with a backwards-compatible alias and minimal logic changes; risk is limited to edge cases around argument validation/warning behavior.

Overview
get_training_chat_template now takes a processing_class (tokenizer or ProcessorMixin) and updates its docs/types accordingly, aligning the public API with existing processor-based call sites.

For backward compatibility it keeps a deprecated tokenizer alias, emitting a FutureWarning, validating that only one of the two args is passed, and improving the error message wording when patching is unsupported.

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[albertvillanova]

CI is red:

AttributeError: 'NoneType' object has no attribute 'chat_template'