[Graphbolt] [NFC] Remove default backend torch.distributed.init_process_group calls #7870
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See pytorch/pytorch#147631 With newer torch versions, the behavior in these locations was changed from initializing nccl+gloo to only initializing gloo. The changed test relies on both backends existing and would fail on newer torch versions.
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With newer pytorch versions, the behavior in these locations was changed from initializing nccl+gloo to only initializing nccl.
Now, all locations explicitly specify their desired backends. These additions maintain expected torch<=2.4 behavior on torch>=2.6. The changed test relies on both backends existing and would fail on newer torch versions.
See pytorch/pytorch#147631