Remove unnecessary data storage from dgl graphs in MGLDataset

[kenko911]

Summary

Remove unnecessary data storage from dgl graphs in MGLDataset

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install

[kenko911]

The only unit test fails coming from test_entrypoint in test_cif.py. This is strange that I tested it with my local machine using pymatgen 2024.2.8 and it passed. It seems the issues come from materialsproject/pymatgen#3664

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.80%. Comparing base (cb3f834) to head (f89e42e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   98.79%   98.80%           
=======================================
  Files          33       33           
  Lines        2749     2750    +1     
=======================================
+ Hits         2716     2717    +1     
  Misses         33       33           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kenko911]

I just updated the latest version of pymatgen and now it works!!