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[release/2.13] Fix test_dataloader tests for python 3.14 (#3740) - #3928
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forkserver preloads __main__ and then os.fork()s workers (this preload actually runs on Python 3.14). Importing this module calls torch.cuda.is_available(), which registers the CUDA atfork handler, so those workers cannot initialize CUDA. Leave __main__ out of the preload so forkserver CUDA workers still start from a clean interpreter. Fixed unit tests: test_dataloader.py::TestDataLoader::test_multiprocessing_contexts test_dataloader.py::TestDataLoaderPersistentWorkers::test_multiprocessing_contexts test_dataloader.py::TestDataLoaderDeviceTypeCUDA::test_nested_tensor_multiprocessing_context_forkserver_cuda
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Cherry-pick of #3740