Support ES-MDA weights from config

[dafeda]

Allow UPDATE_ALGORITHM ES_MDA WEIGHTS to define default ES-MDA weights for CLI and GUI runs, while preserving explicit CLI/GUI overrides.

Issue
Resolves #13540

Adding this to config:

UPDATE_ALGORITHM ES_MDA WEIGHTS 1, 1, 1

Gives this on start:

Changing weights in GUI gives a warning:

Closing ert, changing weights in config and re-opening ert uses the new weights:

Question: should this throw a warning?

• 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 'just rapid-tests')

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: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.76471% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.64%. Comparing base (8d253e0) to head (2c9e468).

Files with missing lines	Patch %	Lines
...ui/experiments/multiple_data_assimilation_panel.py	91.11%	4 Missing ⚠️
src/ert/config/analysis_config.py	90.90%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13553   +/-   ##
=======================================
  Coverage   89.63%   89.64%           
=======================================
  Files         460      460           
  Lines       32519    32582   +63     
=======================================
+ Hits        29150    29208   +58     
- Misses       3369     3374    +5     

Flag	Coverage Δ
cli-tests	36.97% <30.58%> (-0.05%)	⬇️
fuzz	43.92% <17.64%> (-0.05%)	⬇️
gui-tests	63.73% <78.82%> (+0.02%)	⬆️
performance-and-unit-tests	78.07% <89.41%> (+0.02%)	⬆️
test	45.57% <14.11%> (-0.06%)	⬇️

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

Files with missing lines	Coverage Δ
src/ert/__main__.py	87.50% <ø> (-0.05%)	⬇️
src/ert/config/parsing/config_keywords.py	100.00% <100.00%> (ø)
src/ert/config/parsing/config_schema.py	100.00% <100.00%> (ø)
src/ert/run_models/model_factory.py	97.69% <ø> (ø)
src/ert/run_models/multiple_data_assimilation.py	93.93% <100.00%> (+0.13%)	⬆️
src/ert/config/analysis_config.py	96.55% <90.90%> (-1.67%)	⬇️
...ui/experiments/multiple_data_assimilation_panel.py	93.91% <91.11%> (-0.77%)	⬇️

... and 2 files with indirect coverage changes

[codspeed-hq]

Merging this PR will not alter performance

✅ 36 untouched benchmarks

---

_{Comparing dafeda:es-mda-weights (2c9e468) with main (8d253e0)}