adjust unit tests for `test_save_load_float16` #1869

Job	Run time
check_code_quality	31s
check_repository_consistency	29s
Examples PyTorch CUDA tests on Ubuntu	1h 19m 47s
Setup Torch Pipelines CUDA Slow Tests Matrix	46s
Torch CUDA Tests (others)	1m 21s
Torch CUDA Tests (lora)	11m 17s
Torch CUDA Tests (schedulers)	3m 5s
Torch CUDA Tests (models)	9m 58s
Torch Pipelines CUDA Tests (controlnet)	7m 2s
Torch Pipelines CUDA Tests (flux)	2m 55s
Torch Pipelines CUDA Tests (controlnet_sd3)	1m 48s
Torch Pipelines CUDA Tests (stable_diffusion_2)	2m 50s
Torch Pipelines CUDA Tests (stable_diffusion_3)	1m 50s
Torch Pipelines CUDA Tests (controlnet_flux)	1m 45s
Torch Pipelines CUDA Tests (stable_diffusion)	3m 1s
Torch Pipelines CUDA Tests (stable_diffusion_xl)	3m 51s
Torch Pipelines CUDA Tests (ip_adapters)	1m 11s
	2h 13m 27s

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