support torch.jit for maj_vote_spk_count=True
# What does this PR do ?

support torch.jit.save for offline clustering maj_vote_spk_count=True

**Collection**: [Note which collection this PR will affect]

# Changelog 

- for torch.jit, remove redundant torch.tensor on `est_num_of_spk_list` in `offline_clustering.py`

# Usage

```bash
pytest tests/collections/asr/test_diar_utils.py::TestSpeakerClustering::test_offline_speaker_clustering
```


# 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)
- [x] Did you write any new necessary tests?
- [x] 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?

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.

main reviewer: @tango4j 

This is a part of ASR, diarizer.
@titu1994 @redoctopus, @jbalam-nv, or @okuchaiev



# Additional Information
* Related to # (issue)
