ROX-32714: Update UI tests to work with FlattenImageData enabled

[charmik-redhat]

Description

change me!

User-facing documentation

• CHANGELOG update is not needed
• documentation is not needed

Testing and quality

• the change is production ready: the change is GA, or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

Ran tests with and without FlattenImageData enabled

[github-actions]

🚀 Build Images Ready

Images are ready for commit 18f8fa4. To use with deploy scripts:

export MAIN_IMAGE_TAG=4.11.x-568-g18f8fa45bb

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.60%. Comparing base (065e233) to head (18f8fa4).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #19845   +/-   ##
=======================================
  Coverage   49.60%   49.60%           
=======================================
  Files        2763     2763           
  Lines      208339   208339           
=======================================
+ Hits       103342   103344    +2     
+ Misses      97331    97330    -1     
+ Partials     7666     7665    -1     

Flag	Coverage Δ
go-unit-tests	49.60% <ø> (+<0.01%)	⬆️

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