Espresso: faster tests

[tomdemeyere]

Summary of Changes

As discussed in #1789 some parallelization flags can help make espresso tests faster

Checklist

• I have read the "Guidelines" section of the contributing guide. Don't lie! 😉
• My PR is on a custom branch and is not named main.
• I have added relevant, comprehensive unit tests.

Notes

• Your PR will likely not be merged without proper and thorough tests.
• If you are an external contributor, you will see a comment from @buildbot-princeton. This is solely for the maintainers.
• When your code is ready for review, ping one of the active maintainers.

Closes #1818.

[buildbot-princeton]

Can one of the admins verify this patch?

[tomdemeyere]

It seems that OMP_NUM_THREADS=8 is indeed very inefficient, tests are down to 1m25.

I will let you deal with the details?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.42%. Comparing base (9ab2ea5) to head (4ae8f1f).

❗ Current head 4ae8f1f differs from pull request most recent head a0c7bb5. Consider uploading reports for the commit a0c7bb5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1819   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          80       80           
  Lines        3112     3112           
=======================================
  Hits         3094     3094           
  Misses         18       18           

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[Andrew-S-Rosen]

tests / tests-defects-phonons-espresso (pull_request) Successful in 3m

Absolutely wild!!! 🔥 I can sort out the rest.