clean warnings from tests and CI runs, and prepare for upgrade to PTL 1.8
Signed-off-by: nithinraok <nithinrao.koluguri@gmail.com>

# What does this PR do ?

Remove warnings from core and ASR code. NLP part needs more rework than expected. 

**Collection**: Core, ASR

# Changelog 
- [x] weights_save_path has been removed
- [x] Some changes on ptl self.log sync_dist = True 
- [x] torch.qr -> torch.linalg.qr 
- [x] on_pretrain_routine_start -> on_fit_start
- [x] Update most metrics to have full_state_update = True variable
- [x] Pytest  remove with_downloads marker warning 
- [x] regex escape sequence and np float deprecation


# Before your PR is "Ready for review"
**Pre checks**:
- [ ] 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
- [ ] Bugfix
- [ ] Documentation
