941269a6c5
### What this PR does / why we need it? Communication performance optimization: replace allreduce with reduce_scatter+all_gather in MLA layer's TP group，to remove stridedsliced and all_gather in MOE layer. when tp > 1, It is enabled during the decode phase of the graph mode when enable_multistream_moe、MLA, use_v1, and MC2 are used. According to the end-to-end RL inference test results, this PR can bring 3% gain in the decode stage. **Before Improvement** Profiling kernel_details  Evaluation   **After Improvement** Profiling kernel_details  Evaluation   ### Does this PR introduce _any_ user-facing change? Users need to configure enable_multistream_moe=True ### How was this patch tested? Add e2e test cases to cover code logic Signed-off-by: sharonyunyun <zhangying134@huawei.com>