chore(operator): fix linter issues

[odubajDT]

Signed-off-by: odubajDT ondrej.dubaj@dynatrace.com

Fixes: #485

• introduce linter ignorers on places where it does not makes sense to refactor (reduces readability and possible changes options, increases complexity)
• refactoring -> reducing complexity of functions according to linter errors

[codecov]

Codecov Report

Merging #579 (6304702) into main (9b31b04) will increase coverage by 0.19%.
The diff coverage is 58.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #579      +/-   ##
==========================================
+ Coverage   53.14%   53.34%   +0.19%     
==========================================
  Files          69       69              
  Lines        5903     6003     +100     
==========================================
+ Hits         3137     3202      +65     
- Misses       2659     2690      +31     
- Partials      107      111       +4     

Impacted Files	Coverage Δ
...s/lifecycle/v1alpha1/keptnappversion_conversion.go	100.00% <ø> (ø)
...cle/v1alpha1/keptnevaluationprovider_conversion.go	100.00% <ø> (ø)
...r/apis/lifecycle/v1alpha2/keptnappversion_types.go	97.52% <ø> (ø)
.../lifecycle/v1alpha2/keptnworkloadinstance_types.go	95.16% <ø> (ø)
...ontrollers/lifecycle/keptnevaluation/controller.go	0.00% <0.00%> (ø)
operator/webhooks/pod_mutating_webhook.go	35.83% <ø> (ø)
...rator/controllers/lifecycle/keptntask/job_utils.go	38.31% <35.29%> (-1.69%)	⬇️
...lers/lifecycle/keptnworkloadinstance/controller.go	78.24% <72.72%> (-0.85%)	⬇️
operator/controllers/common/taskhandler.go	79.71% <81.81%> (+1.63%)	⬆️
operator/controllers/common/evaluationhandler.go	79.71% <82.08%> (+1.63%)	⬆️
... and 14 more

Flag	Coverage Δ
component-tests	53.33% <57.24%> (+2.50%)	⬆️
keptn-lifecycle-operator	51.60% <54.79%> (+0.28%)	⬆️
scheduler	21.17% <ø> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
4 Code Smells

No Coverage information
0.0% Duplication

[sonarcloud]

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