replaced classification model with EncDecSpeakerLabelModel
<!-- 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.asr.models.classification_models
nemo/collections/asr/models/classification_models.py:381:0: C0301: Line too long (122/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:516:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:726:0: C0301: Line too long (163/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:727:0: C0301: Line too long (165/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:938:0: C0301: Line too long (140/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:939:0: C0301: Line too long (142/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:940:0: C0301: Line too long (140/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:941:0: C0301: Line too long (151/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:942:0: C0301: Line too long (149/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:1034:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/asr/models/classification_models.py:49:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/models/classification_models.py:57:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/models/classification_models.py:161:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/models/classification_models.py:488:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/models/classification_models.py:613:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/models/classification_models.py:631:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/models/classification_models.py:640:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/models/classification_models.py:708:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/asr/models/classification_models.py:818:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/asr/models/classification_models.py:43:0: W0611: Unused deprecated imported from nemo.utils.decorators (unused-import)

-----------------------------------
Your code has been rated at 9.61/10
```

---

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!
# What does this PR do ?

This PR Replaced ASR classification model with EncDecSpeakerLabelModel without a need to change a lot of code parts 
**Collection**: ASR

# Changelog 
- Add specific line by line info of high level changes in this PR.


  
**PR Type**:
- [x] Refactoring

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)
