check restore_config first

[akoumpa]

What does this PR do ?

_find_trainer_ckpt_path crashes if it restores from an imported ckpt with a restore config.

Collection: [Note which collection this PR will affect]

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[github-actions]

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.lightning.resume
nemo/lightning/resume.py:99:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/resume.py:102:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/resume.py:265:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/resume.py:278:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.77/10

---

Mitigation guide:

• Add sensible and useful docstrings to functions and methods
• For trivial methods like getter/setters, consider adding # pylint: disable=C0116 inside the function itself
• To disable multiple functions/methods at once, put a # pylint: disable=C0116 before the first and a # pylint: enable=C0116 after the last.

By applying these rules, we reduce the occurance of this message in future.

Thank you for improving NeMo's documentation!

[github-actions]

[🤖]: Hi @akoumpa 👋,

We wanted to let you know that a CICD pipeline 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