feat(crd): Refactor prometheus metrics

[dkarpele]

Prometheus metrics were successfully exported after refactoring

dkarpele@dkarpele-mac /tmp % curl --insecure --header "Authorization: Bearer ${TOKEN}" https://127.0.0.1:8443/metrics | grep argocd
argocd_image_updater_applications_watched_total The total number of applications watched by Argo CD Image Updater CR
# TYPE argocd_image_updater_applications_watched_total gauge
argocd_image_updater_applications_watched_total{image_updater_cr_name="image-updater-001",image_updater_cr_namespace="argocd-image-updater-system"} 1
# HELP argocd_image_updater_k8s_api_errors_total The total number of K8S API requests resulting in error
# TYPE argocd_image_updater_k8s_api_errors_total counter
argocd_image_updater_k8s_api_errors_total 0
# HELP argocd_image_updater_k8s_api_requests_total The total number of K8S API requests performed by the Argo CD Image Updater
# TYPE argocd_image_updater_k8s_api_requests_total counter
argocd_image_updater_k8s_api_requests_total 0

• Remove legacy flags health-port and metrics-port and replace them with health-probe-bind-address and metrics-bind-address. Update docs.
• health module was removed in favor of controller-runtime.
• Add RBAC rules for metrics.
• Images metrics will be implemented in GITOPS-8068

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.22222% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.57%. Comparing base (58d2b7e) to head (2d26552).

Files with missing lines	Patch %	Lines
cmd/run.go	33.33%	6 Missing ⚠️
cmd/common.go	0.00%	1 Missing ⚠️
pkg/webhook/server.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1243      +/-   ##
==========================================
+ Coverage   70.35%   70.57%   +0.21%     
==========================================
  Files          50       49       -1     
  Lines        4460     4448      -12     
==========================================
+ Hits         3138     3139       +1     
+ Misses       1129     1116      -13     
  Partials      193      193              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.