fix(operator): look up latest AppVersion based on creation timestamp

[bacherfl]

Closes #1185

[netlify]

✅ Deploy Preview for keptn-lifecycle-toolkit ready!

Name	Link
🔨 Latest commit	50155c8
🔍 Latest deploy log	https://app.netlify.com/sites/keptn-lifecycle-toolkit/deploys/642e64d41c7550000812f8aa
😎 Deploy Preview	https://deploy-preview-1186--keptn-lifecycle-toolkit.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[codecov]

Codecov Report

Merging #1186 (50155c8) into main (c164595) will decrease coverage by 0.41%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1186      +/-   ##
==========================================
- Coverage   59.03%   58.63%   -0.41%     
==========================================
  Files         128      114      -14     
  Lines       10050     9493     -557     
==========================================
- Hits         5933     5566     -367     
+ Misses       3899     3753     -146     
+ Partials      218      174      -44     

Impacted Files	Coverage Δ
...lers/lifecycle/keptnworkloadinstance/controller.go	82.62% <100.00%> (-0.34%)	⬇️

... and 25 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	?
lifecycle-operator	?
metrics-operator	77.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication