1469 Correct nonageresolved indices in IDE-SECIR model

[annawendler]

Changes and Information

In the IDE-SECIR model, two indices were not adapted for multiple age groups. This was corrected here and appropriate test was added to check the correctness of the ageresolved simulation.

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Closes #1469

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.37%. Comparing base (79088be) to head (cdabdbc).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1472      +/-   ##
==========================================
+ Coverage   97.31%   97.37%   +0.06%     
==========================================
  Files         187      189       +2     
  Lines       16017    16561     +544     
==========================================
+ Hits        15587    16127     +540     
- Misses        430      434       +4     

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[reneSchm]

Very nice documentation for the new test. The only important comment is on line 278 regarding testing interactions between age groups.

[reneSchm]

All looking good!