Test/integration/rework

[phbelitz]

Rework of integration tests

Checklist

• PR is rebased to/aimed at branch develop
• PR follows Contributing Guide
• Added tests (if necessary)
• Extended README/Documentation (if necessary)
• Adjusted versions of image and Helm chart in Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.87%. Comparing base (1562cd9) to head (a7c43ed).
Report is 6 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1607      +/-   ##
===========================================
- Coverage    88.08%   87.87%   -0.22%     
===========================================
  Files           36       35       -1     
  Lines         2509     2465      -44     
===========================================
- Hits          2210     2166      -44     
  Misses         255      255              
  Partials        44       44              

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[Starkteetje]

Overall, I like the restructuring. Added a few more comments, mainly wrt to bash settings and making user-system controlled variables that may contain spaces be a single word in commands

The bigger comment from before that this doesn't allow me to just run a single command to fully test the setup, e.g. something like an 'all', is still not addressed. Wouldn't the previous run_integration_test script not work equally well with the modularized tests?