fix: support api versions for k8s workloadobjects, add tests

[xopham]

fixes #382

description

• adds integration tests for workload objects and api versions for each Kubernetes version
• fixes currently unsupported api versions

checklist

• according to Contributing guide
• tests added where necessary

[codecov-commenter]

Codecov Report

Merging #396 (4a8ccd5) into develop (8eab731) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #396   +/-   ##
========================================
  Coverage    96.68%   96.68%           
========================================
  Files           21       21           
  Lines         1057     1057           
========================================
  Hits          1022     1022           
  Misses          35       35           

Impacted Files	Coverage Δ
connaisseur/workload_object.py	100.00% <ø> (ø)

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[xopham]

@annekebr but then this pr fails. I renamed the pr to make it: fixing the workload object api versions, added tests accordingly. Would that work?

[annekebr]

It would probably be sufficient to deploy a valid signed image without error, wouldn't it? But as long as we don't run into timing issues, I don't mind testing more :)

[xopham]

that is what I thought and it seems that the k3s never fails with timing issues