rename protocoldag_cache to protocoldag-results_cache

[atravitz]

after testing out https://github.com/OpenFreeEnergy/openfe/1848, I think that we should rename this to make it clearer.

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[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (85711c3) to head (1e1a99f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #764   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files          42       42           
  Lines        2703     2703           
=======================================
  Hits         2673     2673           
  Misses         30       30           

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[IAlibay]

naming change seems reasonable to me