Remove unused test markers

[oyvindeide]

Clean up some test markers

• 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 (72babc5) to head (e36e1cb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9531      +/-   ##
==========================================
+ Coverage   91.85%   91.86%   +0.01%     
==========================================
  Files         433      433              
  Lines       26767    26767              
==========================================
+ Hits        24586    24590       +4     
+ Misses       2181     2177       -4     

Flag	Coverage Δ
cli-tests	39.78% <ø> (ø)
everest-models-test	34.67% <ø> (-0.03%)	⬇️
gui-tests	72.13% <ø> (-0.03%)	⬇️
integration-test	37.21% <ø> (-0.03%)	⬇️
performance-tests	52.07% <ø> (+0.09%)	⬆️
test	40.48% <ø> (ø)
unit-tests	74.13% <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.

[DanSava]

Looks good 🍥

[codspeed-hq]

CodSpeed Performance Report

Merging #9531 will improve performances by 26.32%

_{Comparing oyvindeide:remove_unused (e36e1cb) with main (72babc5)}

Summary

⚡ 1 improvements
✅ 22 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	oyvindeide:remove_unused	Change
⚡	test_gui_snapshot	3.2 s	2.6 s	+26.32%