Sortformer Diarizer 4spk v1 model PR Part 2: Unit-tests for Sortformer Diarizer.
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# What does this PR do ?

This is the second PR that deals with unit tests for 
Sortformer Diarizer Model, 4 speaker limit, v1 model. 

**Previous PR:**
This is PR 2nd out of 3.
1st PR: https://github.com/NVIDIA/NeMo/pull/11336
3rd PR:  <Coming Soon>

**Sortformer Paper:**
[Sortformer Paper Link](https://arxiv.org/pdf/2409.06656)

**Overview:**
- We moved all the speaker recognition related test files from 
`NeMo/tests/collections/asr` to `NeMo/tests/collections/speaker_tasks`.
- We have added all Sortformer diarizer related unit-test functions and classes.

**Collection**: ASR

# Changelog 

Updated the `test_data.tar.gz` file in https://github.com/NVIDIA/NeMo/releases/tag/v1.0.0rc1

```bash
NeMo/tests/collections/speaker_tasks/.
├── test_diar_datasets.py (moved, modified)
├── test_diar_label_models.py (moved, modified)
├── test_diar_lhotse_datasets.py (created)
├── test_diar_metrics.py (moved, modified)
├── test_diar_neural_inference.py (moved, modified) 
├── test_diar_sortformer_models.py (created)
├── test_speaker_label_models.py (moved)
└── utils
    ├── test_data_simul_utils.py (moved)
    ├── test_diar_utils.py (moved)
    ├── test_multispeaker_utils.py (created)
    └── test_vad_utils.py (moved)
```

# Usage

```python
pytest <NeMo Root>/tests/collections/speaker_tasks/*
```

# GitHub Actions CI

Added the new CIs for Sortformer Diarizer.

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- [ ] Bugfix
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# Additional Information
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