feat(lifecycle-operator): clean up KeptnTask API by removing duplicated attributes

[bacherfl]

Closes #1946

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[codecov]

Codecov Report

Merging #1965 (54abff7) into main (6273709) will decrease coverage by 0.06%.
Report is 4 commits behind head on main.
The diff coverage is 94.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1965      +/-   ##
==========================================
- Coverage   84.00%   83.95%   -0.06%     
==========================================
  Files         142      143       +1     
  Lines        8817     8811       -6     
==========================================
- Hits         7407     7397      -10     
- Misses       1148     1151       +3     
- Partials      262      263       +1     

Files Changed	Coverage Δ
...or/apis/lifecycle/v1alpha3/keptntask_conversion.go	0.00% <0.00%> (ø)
...rator/controllers/lifecycle/keptntask/job_utils.go	72.81% <ø> (-0.30%)	⬇️
...r/apis/lifecycle/v1alpha3/keptnappversion_types.go	97.68% <100.00%> (+0.04%)	⬆️
...perator/apis/lifecycle/v1alpha3/keptntask_types.go	97.59% <100.00%> (ø)
.../lifecycle/v1alpha3/keptnworkloadinstance_types.go	95.49% <100.00%> (+0.08%)	⬆️
...controllers/lifecycle/keptntask/runtime_builder.go	70.44% <100.00%> (ø)

... and 3 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	68.55% <ø> (ø)
component-tests	58.89% <100.00%> (-0.04%)	⬇️
lifecycle-operator	84.94% <94.73%> (+0.01%)	⬆️
metrics-operator	85.57% <ø> (ø)
scheduler	32.12% <ø> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication