Deprecate `upcast_vae` in SDXL based pipelines #1867

Job	Run time
check_code_quality	35s
check_repository_consistency	33s
Torch CUDA Tests (schedulers)	5m 50s
Setup Torch Pipelines CUDA Slow Tests Matrix	51s
Torch CUDA Tests (others)	1m 24s
Examples PyTorch CUDA tests on Ubuntu	1h 22m 17s
Torch CUDA Tests (models)	10m 13s
Torch CUDA Tests (lora)	15m 27s
Torch Pipelines CUDA Tests (controlnet_flux)	4m 29s
Torch Pipelines CUDA Tests (flux)	5m 5s
Torch Pipelines CUDA Tests (stable_diffusion)	5m 43s
Torch Pipelines CUDA Tests (stable_diffusion_xl)	6m 20s
Torch Pipelines CUDA Tests (ip_adapters)	3m 23s
Torch Pipelines CUDA Tests (controlnet)	9m 8s
Torch Pipelines CUDA Tests (stable_diffusion_2)	4m 55s
Torch Pipelines CUDA Tests (controlnet_sd3)	4m 3s
Torch Pipelines CUDA Tests (stable_diffusion_3)	4m 2s
	2h 44m 18s

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