remove deprecated params from model parallel config

[dimapihtar]

What does this PR do ?

Removes deprecated moe_extended_tp, async_tensor_model_parallel_allreduce params from MP config as a part of MLM clenaup.

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flowchart LR
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[dimapihtar]

/ok to test d105a35

[svcnvidia-nemo-ci]

🔄 Merge queue validation started!

You can track the progress here: https://github.com/NVIDIA/Megatron-LM/actions/runs/22320992953