Add SFT/PEFT HF tests
[🤖]: Hi @akoumpa 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12292184814) 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 <!-- 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 hf
examples/llm/peft/hf.py:25:0: C0301: Line too long (184/119) (line-too-long)
examples/llm/peft/hf.py:77:0: C0301: Line too long (162/119) (line-too-long)
examples/llm/peft/hf.py:21:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.data.hf_dataset
nemo/collections/llm/gpt/data/hf_dataset.py:24:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:178:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:183:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:208:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:234:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:238:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:242:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:245:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:248:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:251:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:254:4: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.model.hf_auto_model_for_causal_lm
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:26:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:34:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:47:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:73:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:84:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:87:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:107:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:110:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:125:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:137:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.02/10
```

---

Thank you for improving NeMo's documentation! <!-- 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 hf
examples/llm/peft/hf.py:25:0: C0301: Line too long (184/119) (line-too-long)
examples/llm/peft/hf.py:77:0: C0301: Line too long (162/119) (line-too-long)
examples/llm/peft/hf.py:21:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.data.hf_dataset
nemo/collections/llm/gpt/data/hf_dataset.py:24:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:178:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:183:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:208:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:234:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:238:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:242:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:245:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:248:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:251:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/hf_dataset.py:254:4: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.model.hf_auto_model_for_causal_lm
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:26:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:34:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:47:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:73:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:84:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:87:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:107:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:110:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:125:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/model/hf_auto_model_for_causal_lm.py:137:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.02/10
```

---

Thank you for improving NeMo's documentation!
# What does this PR do ?

Add CI tests for PEFT/SFT with HF models for single gpu and DDP setups.

TODO (pending on hf ckpt work for perf): tests for saving / resuming from ckpt. 



**Collection**: [Note which collection this PR will affect]

# Changelog 
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```python
# Add a code snippet demonstrating how to use this 
```

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# Additional Information
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