feat(operator): introduce validating webhook for KeptnConfig

[thisthat]

Signed-off-by: Giovanni Liva [email protected]

Part of #1095

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[codecov]

Codecov Report

Merging #1100 (55301d2) into main (8a7a6af) will increase coverage by 0.37%.
The diff coverage is 61.53%.

❗ Current head 55301d2 differs from pull request most recent head 7328263. Consider uploading reports for the commit 7328263 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1100      +/-   ##
==========================================
+ Coverage   58.98%   59.36%   +0.37%     
==========================================
  Files         126      128       +2     
  Lines       10007    10100      +93     
==========================================
+ Hits         5903     5996      +93     
+ Misses       3888     3886       -2     
- Partials      216      218       +2     

Impacted Files	Coverage Δ
...rator/apis/options/v1alpha1/keptnconfig_webhook.go	52.38% <52.38%> (ø)
...ator/controllers/options/keptnconfig_controller.go	84.90% <100.00%> (+2.40%)	⬆️

... and 8 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	64.15% <ø> (ø)
component-tests	59.97% <ø> (-0.73%)	⬇️
lifecycle-operator	78.45% <61.53%> (+0.04%)	⬆️
metrics-operator	77.35% <ø> (ø)
scheduler	21.17% <ø> (ø)

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

[bacherfl]

let's fix the linting errors, the rest looks good to me

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication