Add coverage gathering of everest

[eivindjahren]

Adds test & coverage statistics also for everest. Result can be seen here: https://app.codecov.io/gh/equinor/ert/pull/9416

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (c9fc8d3) to head (d6f96ab).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9416      +/-   ##
==========================================
+ Coverage   90.42%   91.86%   +1.43%     
==========================================
  Files         349      433      +84     
  Lines       21890    26655    +4765     
==========================================
+ Hits        19794    24486    +4692     
- Misses       2096     2169      +73     

Flag	Coverage Δ
cli-tests	39.42% <ø> (+0.13%)	⬆️
everest-models-test	34.84% <ø> (?)
gui-tests	72.37% <ø> (+0.28%)	⬆️
integration-test	37.14% <ø> (?)
performance-tests	52.08% <ø> (+1.24%)	⬆️
test	40.54% <ø> (?)
unit-tests	74.03% <ø> (-5.17%)	⬇️

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[andreas-el]

🏖️