fix(flux): tighten check_inputs validation (#13955) #5614

Job	Run time
PyTorch xformers CUDA tests	7m 20s
PyTorch Compile CUDA tests	49m 13s
Setup Torch Pipelines CUDA Slow Tests Matrix	1m 9s
Examples PyTorch CUDA tests on Ubuntu	43m 17s
Torch CUDA Tests (others)	5m 9s
Torch CUDA Tests (single_file)	4m 51s
Torch CUDA Tests (hooks)	4m 6s
Torch CUDA Tests (schedulers)	6m 22s
Torch CUDA Tests (lora)	26m 44s
Torch CUDA Tests (models)	1h 54m 15s
Torch Pipelines CUDA Tests (flux2)	7m 27s
Torch Pipelines CUDA Tests (chroma)	4m 1s
Torch Pipelines CUDA Tests (flux)	6m 7s
Torch Pipelines CUDA Tests (controlnet)	15m 24s
Torch Pipelines CUDA Tests (controlnet_flux)	4m 29s
Torch Pipelines CUDA Tests (ernie_image)	3m 39s
Torch Pipelines CUDA Tests (hidream_image)	4m 31s
Torch Pipelines CUDA Tests (hunyuandit)	4m 7s
Torch Pipelines CUDA Tests (qwenimage)	14m 40s
Torch Pipelines CUDA Tests (hunyuan_video)	5m 40s
Torch Pipelines CUDA Tests (latent_consistency_models)	5m 1s
Torch Pipelines CUDA Tests (stable_diffusion_2)	6m 57s
Torch Pipelines CUDA Tests (ip_adapters)	3m 44s
Torch Pipelines CUDA Tests (ltx)	5m 14s
Torch Pipelines CUDA Tests (stable_diffusion)	7m 53s
Torch Pipelines CUDA Tests (sana)	9m 58s
Torch Pipelines CUDA Tests (controlnet_sd3)	4m 21s
Torch Pipelines CUDA Tests (marigold)	5m 31s
Torch Pipelines CUDA Tests (stable_diffusion_xl)	8m 44s
Torch Pipelines CUDA Tests (stable_diffusion_3)	4m 33s
Torch Pipelines CUDA Tests (stable_video_diffusion)	4m 5s
Torch Pipelines CUDA Tests (text_to_video_synthesis)	3m 38s
Torch Pipelines CUDA Tests (wan)	8m 5s
Torch Pipelines CUDA Tests (z_image)	7m 57s
	6h 58m 12s

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