Fix Windows bug with save_restore_connector
Signed-off-by: Daniel Egert <degert@nvidia.com>

# What does this PR do ?

Fixes a bug with saving Nemo models using model.save_to()

**Collection**: core

# Changelog 
- Changed some ordering in nemo/core/connectors/save_restore_connector.py

# Usage
To trigger the bug, and check it's fixed:

```python
from nemo.collections.asr.models import ASRModel

model = ASRModel.restore_from(...)

model.save_to(...)    # crashes on Windows without this fix
```

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**PR Type**:
- [ ] New Feature
- [X] Bugfix
- [ ] Documentation

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# Additional Information

If you look at all of the uses of `with tempfile.TemporaryDirectory()` in save_restore_connector.py, you will see they all adhere to putting the tempfile context outer to the try-finally for the os.chdir call. However, this is not the case for `_handle_artifacts` which leads me to believe this is a bug where someone wrote `_handle_artifacts` without paying attention to the previous design pattern for tempfile context used throughout the same file. Unfortunately, deviating from that design pattern has catastrophic problems on Windows, but once we fix it to work like all the other entries in the same file, everything works correctly again. This is what I have done.