replace check for potcar hash with check for potcar summary stats

[tsmathis]

The function .get_potcar_hash() has been removed from the PotcarSingle class in pymatgen. As a stop gap while we are migrating to new validation practices, we need to still be able to verify that the potcars used for a calculation match the pymatgen input set.

The proposed change from @esoteric-ephemera is to now check the potcar summary stats.

[tsmathis]

@esoteric-ephemera , any further comments/details you have would be helpful

[tsmathis]

tests for emmet-core/tests/vasp/ need to be updated as well once the potcar checking is finalized

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.97561% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 90.03%. Comparing base (183d74c) to head (960f19b).
Report is 3 commits behind head on main.

Files	Patch %	Lines
emmet-core/emmet/core/vasp/validation.py	47.05%	9 Missing ⚠️
emmet-builders/emmet/builders/utils.py	68.75%	5 Missing ⚠️
...met-builders/emmet/builders/vasp/task_validator.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #966      +/-   ##
==========================================
+ Coverage   90.01%   90.03%   +0.02%     
==========================================
  Files         138      138              
  Lines       13164    13182      +18     
==========================================
+ Hits        11850    11869      +19     
+ Misses       1314     1313       -1     

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[esoteric-ephemera]

We discussed this a bit and decided that for now, we'll maintain the legacy hash checking when the summary_stats kwarg isn't populated in a TaskDoc / TaskDocument. This field will be populated when parsing a VASP output directory, but is not currently populated in most (probably all) of the MP tasks.

Submitted a PR to this branch to add legacy checking as a fallback when the summary_stats kwarg isn't populated for any single potcar_spec.