xfail for test_openmm_run_engine if openeye and nagl are both present

[atravitz]

I'm adding this xfail until openforcefield/openff-nagl#177 is resolved so that this failure doesn't obscure other failures.

Checklist

• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
• Ran pre-commit by making a comment with pre-commit.ci autofix before requesting review.

Manual Tests: these are slow so don't need to be run every commit, only before merging and when relevant changes are made (generally at reviewer-discretion).

• GPU integration tests: https://github.com/OpenFreeEnergy/openfe/actions/runs/19911573954/job/57081439332
• example notebook testing
• packaging tests: run this for any large feature PRs or PRs that add test data.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.15%. Comparing base (f491184) to head (c945b83).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1733      +/-   ##
==========================================
- Coverage   95.47%   93.15%   -2.32%     
==========================================
  Files         187      187              
  Lines       16244    16241       -3     
==========================================
- Hits        15509    15130     -379     
- Misses        735     1111     +376     

Flag	Coverage Δ
fast-tests	93.15% <100.00%> (?)
slow-tests	?

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