ci: merge upgrade test into integration script

[xopham]

Fixes no issue

Description

• moves upgrade test into integration test script
• full refactoring only in followup MR

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 values.yaml and Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5c88a85) 97.13% compared to head (2144a40) 97.13%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #927   +/-   ##
========================================
  Coverage    97.13%   97.13%           
========================================
  Files           23       23           
  Lines         1290     1290           
========================================
  Hits          1253     1253           
  Misses          37       37           

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