Refactor BaseRunModel

[frode-aarstad]

Issue
Resolves #9604

Approach
Short description of the 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

[codspeed-hq]

CodSpeed Performance Report

Merging #9676 will degrade performances by 15.33%

_{Comparing frode-aarstad:refactor-baserunmodel (4b764b8) with main (383d645)}

Summary

❌ 1 regressions
✅ 23 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	frode-aarstad:refactor-baserunmodel	Change
❌	test_load_from_context[gen_x: 20, sum_x: 20 reals: 10]	6 ms	7.1 ms	-15.33%

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.73%. Comparing base (383d645) to head (4b764b8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9676      +/-   ##
==========================================
- Coverage   91.74%   91.73%   -0.01%     
==========================================
  Files         426      426              
  Lines       26518    26553      +35     
==========================================
+ Hits        24328    24359      +31     
- Misses       2190     2194       +4     

Flag	Coverage Δ
cli-tests	39.79% <87.23%> (+0.08%)	⬆️
everest-models-test	34.26% <62.50%> (+0.04%)	⬆️
gui-tests	71.96% <80.85%> (+0.01%)	⬆️
integration-test	38.09% <64.58%> (+0.03%)	⬆️
performance-tests	51.68% <72.34%> (+0.03%)	⬆️
test	39.63% <64.58%> (+0.03%)	⬆️
unit-tests	74.28% <85.41%> (+0.01%)	⬆️

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