fix(operator): parse flags so they can be configured

[bacherfl]

Closes #1648

Manually tested this by setting the --metrics-bind-address of the lifecycle operator to 127.0.0.1:8087, which resulted in the following log during the operator startup:

2023-07-03T05:53:24Z	INFO	controller-runtime.metrics	Metrics server is starting to listen	{"addr": "127.0.0.1:8087"}

[netlify]

✅ Deploy Preview for keptn-lifecycle-toolkit ready!

Name	Link
🔨 Latest commit	24c93cd
🔍 Latest deploy log	https://app.netlify.com/sites/keptn-lifecycle-toolkit/deploys/649e8a1eac1e870008924856
😎 Deploy Preview	https://deploy-preview-1649--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 configuration.

[codecov]

Codecov Report

Merging #1649 (f95fe2c) into main (791e211) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1649      +/-   ##
==========================================
+ Coverage   63.48%   63.51%   +0.02%     
==========================================
  Files         142      142              
  Lines       10892    10892              
==========================================
+ Hits         6915     6918       +3     
+ Misses       3716     3714       -2     
+ Partials      261      260       -1     

see 3 files with indirect coverage changes

Flag	Coverage Δ
certificate-operator	68.55% <ø> (ø)
component-tests	59.16% <ø> (-0.34%)	⬇️
lifecycle-operator	84.48% <ø> (ø)
metrics-operator	82.26% <ø> (ø)
scheduler	30.45% <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