fix batch to tensor and to device for nested NWP

[dfulu]

The copy_batch_to_device and batch_to_tensor need to be updated for the nested NWP data in the NumpyBatch of datapipes>=2.5

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (ffbfa04) 57.67% compared to head (de08431) 57.65%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
pvnet/data/utils.py	45.45%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   57.67%   57.65%   -0.02%     
==========================================
  Files          26       26              
  Lines        1701     1705       +4     
==========================================
+ Hits          981      983       +2     
- Misses        720      722       +2     

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