Fix release CI

[janosh]

help unblock materialsproject/atomate2#721

test.yml and release.yml workflows had different test setups. the latter install openbabel through miniconda, the former doesn't. as a result only a subset of tests are running on PRs but the full test suite when trying to make release. there was also lots of duplicaton which can avoided with GH reusable workflows after adding the workflow_call trigger to test.yml. makes test.yml the SSOT for how tests should be run

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5148246) 62.54% compared to head (37b6177) 62.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   62.54%   62.54%           
=======================================
  Files          35       35           
  Lines        3006     3006           
=======================================
  Hits         1880     1880           
  Misses       1126     1126           

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