mpi

[renefritze]

• add a config for codecov
• remove obsolete code
• fix test suite
• remove more obsolete code
• re-enable mpi tests

Checklist

• Used a fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.10%. Comparing base (cd4e0d4) to head (16dd48d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   48.10%   48.10%           
=======================================
  Files          14       14           
  Lines        1349     1349           
=======================================
  Hits          649      649           
  Misses        700      700           

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