update_conversion_tool

[chai-xiaonan]

The checkpoint conversion tool must be updated accordingly following the Megatron update.
Error occurred when converting the trained torch-format ckpt to HF safetensor format:
1）The parameter args.expert_tensor_parallel_sizecannot be retrieved.
2）The model_provideris missing the model_builderparameter.
Fixed the two issues mentioned above.

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