Fix checkpoint import for mixtral with padded vocab size.
State: closed | Pull request: yes
Labels: name: Run CICD



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<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module nemo.collections.llm.gpt.model.mixtral
nemo/collections/llm/gpt/model/mixtral.py:157:0: C0301: Line too long (132/119) (line-too-long)
nemo/collections/llm/gpt/model/mixtral.py:323:0: C0301: Line too long (132/119) (line-too-long)
nemo/collections/llm/gpt/model/mixtral.py:119:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/model/mixtral.py:133:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/model/mixtral.py:151:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/mixtral.py:171:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/mixtral.py:177:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/mixtral.py:294:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/model/mixtral.py:317:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/mixtral.py:337:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/mixtral.py:341:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.36/10
```

---

Thank you for improving NeMo's documentation!

[🤖]: Hi @akoumpa 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12251859369) for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g