adjust unit tests for test_save_load_float16
#12500
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When we run unit test like
pytest -rA tests/pipelines/wan/test_wan_22.py::Wan22PipelineFastTests::test_save_load_float16, we found that the pipeline runs w/ all fp16 datatype, but after save and reload, some parts of text-encoder inpipe_loadeduses fp32, although we set torch_dtype to fp16 explicitly. Deep investigation found that the root cause is here: L783. Here we made an adjustment to the test case to manually add thecomponent = component.to(torch_device).half()operation to align excatly with the behavior inpipe