Model saver code deduplication - #1518
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Several model savers (Ernie, Flux2, Z-Image, ...) duplicate the same deepcopy + tokenizer __deepcopy__ workaround to produce a dtype-converted copy of a diffusers pipeline for saving. Extract it into a shared helper so new savers can reuse it. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds a tokenizer_attrs parameter (default ("tokenizer",)) so savers with
extra/different tokenizer attributes (Flux's tokenizer_2, SD3's
tokenizer_3, HiDream's tokenizer_3/tokenizer_4) can use the same helper.
Replaces the duplicated deepcopy + tokenizer __deepcopy__ workaround in
Chroma, Ernie, Flux, Flux2, HiDream, HunyuanVideo, PixArtAlpha, Qwen,
Sana, StableDiffusion3 and Z-Image with calls to the shared helper.
No behavior change.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Minor code deduplication, to avoid having to copy this from model-to-new-model
Test plan
pre-commit run --all-filespassesAI assistance
part of #1203