Move observations parsing to runmodel

[yngve-sk]

Towards #11513. Note: Seems refcase/time map really must be removed for this to work cleanly

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.55%. Comparing base (a29328d) to head (5865504).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12597      +/-   ##
==========================================
- Coverage   90.55%   90.55%   -0.01%     
==========================================
  Files         435      435              
  Lines       29940    29996      +56     
==========================================
+ Hits        27112    27162      +50     
- Misses       2828     2834       +6     

Flag	Coverage Δ
cli-tests	37.42% <90.24%> (+0.07%)	⬆️
gui-tests	68.62% <97.56%> (-0.05%)	⬇️
performance-and-unit-tests	73.93% <100.00%> (+0.01%)	⬆️
test	38.11% <68.29%> (+<0.01%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

Summary

✅ 22 untouched benchmarks

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_{Comparing yngve-sk:26.01.move-observations-handling (5865504) with main (ef47dad)}