Refactor SchedulerOutput and add pred_original_sample in `DPMSolverSD… #3799

Job	Run time
Setup Torch Pipelines CUDA Slow Tests Matrix	2m 5s
Flax TPU Tests	2m 20s
ONNX CUDA Tests	5m 13s
Examples PyTorch CUDA tests on Ubuntu	19m 53s
PyTorch Compile CUDA tests	3m 47s
PyTorch xformers CUDA tests	5m 44s
Torch CUDA Tests (models)	3m 30s
Torch CUDA Tests (schedulers)	2m 51s
Torch CUDA Tests (lora)	3m 28s
Torch CUDA Tests (others)	39s
Torch CUDA Tests (single_file)	1m 25s
Torch Pipelines CUDA Tests (cogvideo)	1m 26s
Torch Pipelines CUDA Tests (controlnet)	7m 44s
Torch Pipelines CUDA Tests (ddpm)	31s
Torch Pipelines CUDA Tests (deepfloyd_if)	1m 54s
Torch Pipelines CUDA Tests (flux)	59s
Torch Pipelines CUDA Tests (ip_adapters)	28s
Torch Pipelines CUDA Tests (kandinsky)	4m 55s
Torch Pipelines CUDA Tests (kandinsky2_2)	5m 37s
Torch Pipelines CUDA Tests (kolors)	1m 24s
Torch Pipelines CUDA Tests (latent_consistency_models)	1m 17s
Torch Pipelines CUDA Tests (pixart_alpha)	48s
Torch Pipelines CUDA Tests (stable_diffusion)	3m 10s
Torch Pipelines CUDA Tests (stable_diffusion_2)	4m 1s
Torch Pipelines CUDA Tests (stable_diffusion_3)	1m 15s
Torch Pipelines CUDA Tests (stable_diffusion_adapter)	1m 46s
Torch Pipelines CUDA Tests (stable_diffusion_xl)	4m 41s
Torch Pipelines CUDA Tests (stable_video_diffusion)	51s
Torch Pipelines CUDA Tests (text_to_video_synthesis)	2m 44s
Torch Pipelines CUDA Tests (wuerstchen)	1m 18s
	1h 37m 44s

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