Get ensembles by id in dark storage

[yngve-sk]

Issue
Resolves #8641

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (cb5ea32) to head (501c0b9).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8643      +/-   ##
==========================================
- Coverage   90.85%   90.84%   -0.02%     
==========================================
  Files         339      339              
  Lines       20897    20897              
==========================================
- Hits        18987    18983       -4     
- Misses       1910     1914       +4     

Flag	Coverage Δ
gui-tests	75.76% <100.00%> (ø)
integration-tests	53.76% <33.33%> (-0.01%)	⬇️
unit-tests	68.64% <91.66%> (-0.01%)	⬇️

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.

[DanSava]

Looks good one small comment!