fix: correct signal for Windows
State: closed | Pull request: yes

Windows uses `signal.SIGTERM` instead of `signal.SIGKILL`.

# What does this PR do ?

Fixes wrong signal under Windows.

**Collection**: [Note which collection this PR will affect]

# Changelog 
- Fixes wrong signal under Windows.

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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# Before your PR is "Ready for review"
**Pre checks**:
- [X] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] 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**:
- [ ] New Feature
- [X] Bugfix
- [ ] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?

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[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

@BBC-Esq @titu1994 @blisc @okuchaiev

# Additional Information
* Related to #10275


<!-- 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.utils.exp_manager
nemo/utils/exp_manager.py:353:0: C0301: Line too long (120/119) (line-too-long)
nemo/utils/exp_manager.py:378:0: C0301: Line too long (124/119) (line-too-long)
nemo/utils/exp_manager.py:382:0: C0301: Line too long (122/119) (line-too-long)
nemo/utils/exp_manager.py:387:0: C0301: Line too long (127/119) (line-too-long)
nemo/utils/exp_manager.py:401:0: C0301: Line too long (120/119) (line-too-long)
nemo/utils/exp_manager.py:408:0: C0301: Line too long (120/119) (line-too-long)
nemo/utils/exp_manager.py:409:0: C0301: Line too long (126/119) (line-too-long)
nemo/utils/exp_manager.py:411:0: C0301: Line too long (136/119) (line-too-long)
nemo/utils/exp_manager.py:413:0: C0301: Line too long (139/119) (line-too-long)
nemo/utils/exp_manager.py:423:0: C0301: Line too long (123/119) (line-too-long)
nemo/utils/exp_manager.py:424:0: C0301: Line too long (128/119) (line-too-long)
nemo/utils/exp_manager.py:425:0: C0301: Line too long (132/119) (line-too-long)
nemo/utils/exp_manager.py:426:0: C0301: Line too long (127/119) (line-too-long)
nemo/utils/exp_manager.py:514:0: C0301: Line too long (122/119) (line-too-long)
nemo/utils/exp_manager.py:602:0: C0301: Line too long (208/119) (line-too-long)
nemo/utils/exp_manager.py:603:0: C0301: Line too long (230/119) (line-too-long)
nemo/utils/exp_manager.py:605:0: C0301: Line too long (178/119) (line-too-long)
nemo/utils/exp_manager.py:642:0: C0301: Line too long (136/119) (line-too-long)
nemo/utils/exp_manager.py:777:0: C0301: Line too long (121/119) (line-too-long)
nemo/utils/exp_manager.py:785:0: C0301: Line too long (156/119) (line-too-long)
nemo/utils/exp_manager.py:832:0: C0301: Line too long (141/119) (line-too-long)
nemo/utils/exp_manager.py:840:0: C0301: Line too long (152/119) (line-too-long)
nemo/utils/exp_manager.py:1110:0: C0301: Line too long (142/119) (line-too-long)
nemo/utils/exp_manager.py:1134:0: C0301: Line too long (154/119) (line-too-long)
nemo/utils/exp_manager.py:1200:0: C0301: Line too long (120/119) (line-too-long)
nemo/utils/exp_manager.py:1219:0: C0301: Line too long (123/119) (line-too-long)
nemo/utils/exp_manager.py:1245:0: C0301: Line too long (121/119) (line-too-long)
nemo/utils/exp_manager.py:91:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:106:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:132:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:141:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:150:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:161:0: C0115: Missing class docstring (missing-class-docstring)
nemo/utils/exp_manager.py:274:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:277:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:280:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:283:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:286:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:289:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:292:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:295:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:333:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:336:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:339:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:342:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:1126:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:1227:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:1246:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:1249:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/utils/exp_manager.py:1265:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.19/10
```

---

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!