fix triton fp8 all_reduce group

[grimoire]

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[Copilot]

Pull request overview

This PR fixes tensor-parallel communication behavior for the Triton FP8 blocked linear backend by ensuring the correct distributed process group is used during all_reduce.

Changes:

• Pass group=group to dist.all_reduce(...) in TritonLinearBlockedF8Impl.forward, aligning it with the existing reduce_scatter_by_tp_sizes(..., group=group) path and the DeepGemm implementation.

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