chore(lifecycle-operator): adapt KeptnAppVersionReconciler to make use of PhaseHandler interface

[bacherfl]

Closes #2418

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[codecov]

Codecov Report

Merging #2463 (58c46a6) into main (8bf50a6) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2463      +/-   ##
==========================================
- Coverage   85.68%   85.57%   -0.12%     
==========================================
  Files         161      161              
  Lines       10202    10196       -6     
==========================================
- Hits         8742     8725      -17     
- Misses       1188     1197       +9     
- Partials      272      274       +2     

Files	Coverage Δ
...ontrollers/lifecycle/keptnappversion/controller.go	73.27% <100.00%> (-8.70%)	⬇️

... and 3 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	67.43% <ø> (ø)
component-tests	56.24% <40.00%> (+0.51%)	⬆️
lifecycle-operator	84.48% <100.00%> (-0.97%)	⬇️
metrics-operator	87.58% <ø> (ø)
scheduler	32.12% <ø> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication