Add batch total objective plots to ERT plotter

[yngve-sk]

[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.28571% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.10%. Comparing base (6b3c53a) to head (57104fb).
⚠️ Report is 9 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../plot/plottery/plots/values_over_iteration_plot.py	5.55%	17 Missing ⚠️
src/ert/dark_storage/endpoints/responses.py	7.14%	13 Missing ⚠️
src/ert/gui/tools/plot/plot_api.py	33.33%	4 Missing ⚠️
src/ert/gui/tools/plot/plot_window.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12900      +/-   ##
==========================================
- Coverage   90.22%   90.10%   -0.12%     
==========================================
  Files         445      445              
  Lines       30763    30841      +78     
==========================================
+ Hits        27755    27789      +34     
- Misses       3008     3052      +44     

Flag	Coverage Δ
cli-tests	36.83% <0.00%> (-0.07%)	⬇️
gui-tests	67.38% <11.90%> (-0.12%)	⬇️
performance-and-unit-tests	76.71% <14.28%> (-0.09%)	⬇️
test	46.01% <2.38%> (-0.11%)	⬇️

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.

[codspeed-hq]

Merging this PR will not alter performance

✅ 34 untouched benchmarks

---

_{Comparing yngve-sk:26.02.add-ever-batch-plots (57104fb) with main (dd0ca6f)}

[berland]

We don't need the title, the information is already in the axis labels.

[berland]

Final go!