Add recipe configs validating
could you also update your branch to latest main, please? I think Pablo have made auto conf tests not optional recently. [🤖]: Hi @BoxiangW 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/11804509420) 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 [🤖]: Hi @BoxiangW 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/11807721394) 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 @maanug-nv How does this relate to your work on validation of configs? <!-- 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.api
nemo/collections/llm/api.py:602:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.data.mock
nemo/collections/llm/gpt/data/mock.py:33:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/gpt/data/mock.py:75:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/mock.py:86:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/mock.py:91:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/mock.py:96:4: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.gpt.data.pre_training
nemo/collections/llm/gpt/data/pre_training.py:136:0: C0301: Line too long (140/119) (line-too-long)
nemo/collections/llm/gpt/data/pre_training.py:137:0: C0301: Line too long (145/119) (line-too-long)
nemo/collections/llm/gpt/data/pre_training.py:138:0: C0301: Line too long (137/119) (line-too-long)
nemo/collections/llm/gpt/data/pre_training.py:390:0: C0301: Line too long (124/119) (line-too-long)
nemo/collections/llm/gpt/data/pre_training.py:397:0: C0301: Line too long (133/119) (line-too-long)
nemo/collections/llm/gpt/data/pre_training.py:49:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:60:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:221:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:284:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:313:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:316:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:319:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:337:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/gpt/data/pre_training.py:387:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.60/10
```

---

Thank you for improving NeMo's documentation! [🤖]: Hi @BoxiangW 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/11923229869) 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 Hi @marcromeyn , can you help take a look at this PR again? Thanks
# What does this PR do ?

Add model config validations for NeMo 2.0

**Collection**: llm

# Changelog 
- Added training and fine-tuning config validation basics for NeMo 2.0.
- Added unit tests for config validation. 


# GitHub Actions CI

The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.

The GitHub Actions CI will run automatically when the "Run CICD" label is added to the PR.
To re-run CI remove and add the label again.
To run CI on an untrusted fork, a NeMo user with write access must first click "Approve and run".

# Before your PR is "Ready for review"
**Pre checks**:
- [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [x] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?

Anyone in the community is free to review the PR once the checks have passed. 
[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Related to # (issue)
