Delete unused evaluate method in ensemble_evaluator_utils

[jonathan-eq]

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

[xjules]

Bare bra! Nice ✂️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (b903bb0) to head (64fc09a).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9472      +/-   ##
==========================================
- Coverage   91.86%   91.83%   -0.03%     
==========================================
  Files         433      433              
  Lines       26654    26686      +32     
==========================================
+ Hits        24486    24508      +22     
- Misses       2168     2178      +10     

Flag	Coverage Δ
cli-tests	39.40% <ø> (-0.04%)	⬇️
everest-models-test	34.80% <ø> (-0.02%)	⬇️
gui-tests	72.28% <ø> (-0.10%)	⬇️
integration-test	37.06% <ø> (-0.02%)	⬇️
performance-tests	52.01% <ø> (-0.06%)	⬇️
test	40.75% <ø> (+<0.01%)	⬆️
unit-tests	74.01% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.