remove deprecated get_te_version

[dimapihtar]

What does this PR do ?

Removes deprecated get_te_version from Bert as a part of MLM code cleanup.

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flowchart LR
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    subgraph Code Review/Approval
        C1[Expert Review] --> C2[Final Review]
    end
    B --> C1
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[dimapihtar]

/ok to test b4e555f

[dimapihtar]

/ok to test e5a3e52

[svcnvidia-nemo-ci]

🔄 Merge queue validation started!

You can track the progress here: https://github.com/NVIDIA/Megatron-LM/actions/runs/22314502218