Remove unused test data

[oyvindeide]

Approach
🧹

(Screenshot of new behavior in GUI if applicable)

• 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 91.85%. Comparing base (01156bb) to head (dd4e9ab).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9582   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files         433      433           
  Lines       26768    26768           
=======================================
+ Hits        24587    24589    +2     
+ Misses       2181     2179    -2     

Flag	Coverage Δ
cli-tests	39.75% <ø> (ø)
everest-models-test	34.58% <ø> (-0.01%)	⬇️
gui-tests	72.11% <ø> (+<0.01%)	⬆️
integration-test	37.19% <ø> (ø)
performance-tests	51.94% <ø> (ø)
test	40.47% <ø> (+0.02%)	⬆️
unit-tests	74.18% <ø> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9582 will not alter performance

_{Comparing oyvindeide:remove_unused_test_data (dd4e9ab) with main (01156bb)}

Summary

✅ 22 untouched benchmarks