Add server ready check before starting evaluation
State: closed | Pull request: yes
Labels: name: Run CICD

# What does this PR do ?

Adds method `wait_for_server_ready` to `evaluation/base.py` that waits for the PyTriton server to be ready and the specific model (with name defined in `model_name` arg) to be loaded and ready before starting evaluation.

Adds bool [generation_logits_available](https://github.com/NVIDIA/NeMo/pull/11731/files#diff-3a3bd49eed8a038989253f6f2e0a01cf494d1de391863d4ab2377a1f7d4cf832R1152) to `triton_infer_fn` since check via `if "output_generation_logits" in inputs` is not robust in cases where `output_generation_logits` is popped from inputs dict in the previous line.

**Collection**: [Note which collection this PR will affect]

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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# Additional Information
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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.api
nemo/collections/llm/api.py:441:0: C0301: Line too long (130/119) (line-too-long)
nemo/collections/llm/api.py:571:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/api.py:15:0: W0611: Unused import os (unused-import)

-----------------------------------
Your code has been rated at 9.96/10
```

---

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!

[🤖]: Hi @athitten 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12643081020) 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