fix: helm chart generation fixes

[mowies]

This PR

• sets the registry correctly to the scarf one for released helm charts
• uses better branch naming for the charts repo PRs so that ehy are overwritten with pushes to keptn/klt main branch

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #977 (a7542bc) into main (82488ec) will increase coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
+ Coverage   57.45%   57.50%   +0.04%     
==========================================
  Files         119      119              
  Lines        9913     9914       +1     
==========================================
+ Hits         5696     5701       +5     
+ Misses       4018     4015       -3     
+ Partials      199      198       -1     

Impacted Files	Coverage Δ
metrics-operator/pkg/metrics/server.go	68.80% <0.00%> (+0.25%)	⬆️
...lers/lifecycle/keptnworkloadinstance/controller.go	82.95% <0.00%> (+1.79%)	⬆️

Flag	Coverage Δ
certificate-operator	64.15% <ø> (?)
component-tests	50.99% <ø> (+0.82%)	⬆️
klt-cert-manager	?
lifecycle-operator	53.63% <ø> (?)
metrics-operator	62.98% <ø> (+0.03%)	⬆️
scheduler	21.17% <ø> (ø)

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[thschue]

lgtm