[Chore] remove deprecation from transformer2d regarding the output class.

[sayakpaul]

What does this PR do?

Follow https://huggingface.slack.com/archives/C03HBN1C8CW/p1719318647536649.

@LysandreJik @julien-c just FYI.

[HuggingFaceDocBuilderDev]

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[yiyixuxu]

let's just deprecate it when it is actually used (not when it is imported)

also can we do a search and make sure to update it for entire codebase (including docs and docstrings). for example, sd3 controlnet used it and we didn't catch that

diffusers/src/diffusers/models/controlnet_sd3.py

Line 30 in c6e08ec

from .transformers.transformer_2d import Transformer2DModelOutput

[sayakpaul]

@yiyixuxu I think I have addressed your comments.

[yiyixuxu]

oh thanks
can we do a search, manually look through all the results, and make sure to update everywhere (including the doc strings) https://github.com/search?q=repo%3Ahuggingface%2Fdiffusers%20Transformer2DModelOutput&type=code

you can see that sd3 is still importing from the wrong place

diffusers/src/diffusers/models/transformers/transformer_sd3.py

Line 31 in e828428

from .transformer_2d import Transformer2DModelOutput

[sayakpaul]

Okay, so I thought the imports would be a bit standardized. Also weird that it didn't show up on VSCode. I think that is what has led to confusion in the past, too. I will do a code search on GitHub itself, as you did. Seems like it's more robust.

[sayakpaul]

Hopefully, this one should cut it 🤞