Fix guess_mode in StableDiffusionXLControlNetPipeline

[YashalKanungo]

Fix guess_mode in StableDiffusionXLControlNetPipeline

What does this PR do?

It fixes a bug due to which guess mode was not usable in StableDiffusionXLControlNetPipeline.

Reproducing the original bug

Following the example at https://huggingface.co/diffusers/controlnet-canny-sdxl-1.0
if we set guess_mode=True

images=pipe(
prompt,
negative_prompt=negative_prompt,
image=image,
controlnet_conditioning_scale=controlnet_conditioning_scale,
guess_mode=True
).images

it throws the error,

RuntimeErrorTraceback (mostrecentcalllast)
CellIn[57], line2421image=np.concatenate([image, image, image], axis=2)
22image=Image.fromarray(image)
--->24images=pipe(
25prompt, negative_prompt=negative_prompt, image=image, controlnet_conditioning_scale=controlnet_conditioning_scale, guess_mode=True26 ).imagesRuntimeError: Thesizeoftensora (8192) mustmatchthesizeoftensorb (4096) atnon-singletondimension1

Fixes

During ControlNet inference for only the conditional batch, also only use the corresponding add_text_embeds and add_time_ids.

Tests

1. Able to generate some images with guess_mode=True
2. Ran test_controlnet_sdxl

pytest tests/pipelines/controlnet/test_controlnet_sdxl.py
...
============================================================= 62 passed, 3 skipped, 165 warnings in 97.70s (0:01:37) ==============================================================

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• [] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [] Did you write any new necessary tests?

Who can review?

• Pipelines: @patrickvonplaten and @sayakpaul

[sayakpaul]

Being addressed in #4155. So, closing this one.

Thank you for your contribution!