[GraphBolt][CUDA] Eliminate synchronization in link prediction preprocessing.
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Description
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Project tracker: https://github.com/orgs/dmlc/projects/2
## Description
`SubgraphSampler.preprocess` function has a unique_and_compact, which requires us to step in to hide the synchronization.
https://github.com/dmlc/dgl/blob/8772c02db74500096174e87f41a7f47ff2fa2248/python/dgl/graphbolt/subgraph_sampler.py#L166
https://github.com/dmlc/dgl/blob/8772c02db74500096174e87f41a7f47ff2fa2248/python/dgl/graphbolt/subgraph_sampler.py#L215
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