Remove unreliable benchmark: test_gui_snapshot

[larsevj]

• 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

[codspeed-hq]

CodSpeed Performance Report

Merging #9566 will not alter performance

_{Comparing larsevj:remove_test_gui_snapshot (b59f341) with main (d4e7b72)}

Summary

✅ 22 untouched benchmarks
⁉️ 1 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	larsevj:remove_test_gui_snapshot	Change
⁉️	test_gui_snapshot	7.1 s	N/A	N/A

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (d4e7b72) to head (b59f341).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9566      +/-   ##
==========================================
- Coverage   91.87%   91.86%   -0.01%     
==========================================
  Files         433      433              
  Lines       26769    26763       -6     
==========================================
- Hits        24594    24586       -8     
- Misses       2175     2177       +2     

Flag	Coverage Δ
cli-tests	39.77% <ø> (-0.01%)	⬇️
everest-models-test	34.66% <ø> (-0.01%)	⬇️
gui-tests	72.12% <ø> (+<0.01%)	⬆️
integration-test	37.21% <ø> (-0.01%)	⬇️
performance-tests	51.96% <ø> (-0.02%)	⬇️
test	40.46% <ø> (-0.01%)	⬇️
unit-tests	74.16% <ø> (-0.02%)	⬇️

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