[Auto Parallel] fix data stream bug of dist.to_static #9077
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ckl117
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Description
to_static方法会对传入的dataloader调用next，以获取input的spec信息。但调用next方法会改变dataloader中sampler的状态。一些场景下，sampler的状态无法恢复，导致dataloader的数据流出现错乱。因此，这里构建一个临时的dataloader，避免对实际训练所用的dataloader产生副作用影响