Remove SIMULATION_JOB keyword

[DanSava]

Issue
Resolves #4955

• 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]

❌ 10 Tests Failed:

Tests completed	Failed	Passed	Skipped
2854	10	2844	97

View the top 3 failed tests by shortest run time

tests/ert/ui_tests/gui/test_plotting_of_snake_oil.py::::test_that_all_snake_oil_visualisations_matches_snapshot[plot_figure3-0]

Stack Traces | 0.019s run time

No failure message available

tests/ert/ui_tests/gui/test_plotting_of_snake_oil.py::::test_that_all_snake_oil_visualisations_matches_snapshot[plot_figure5-0]

Stack Traces | 0.019s run time

No failure message available

tests/ert/ui_tests/gui/test_plotting_of_snake_oil.py::::test_that_all_snake_oil_visualisations_matches_snapshot[plot_figure6-0]

Stack Traces | 0.019s run time

No failure message available

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[codspeed-hq]

CodSpeed Performance Report

Merging #9606 will not alter performance

_{Comparing remove-simulation-job (1120a22) with main (722e0fc)}

Summary

✅ 24 untouched benchmarks