camilamacedo86 / kubebuilder / 21580929472

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feat(helm/v2-alpha): Add Helm chart tests to scaffolded projects

This commit adds built-in Helm tests to validate deployment health in
scaffolded Helm charts. Tests automatically verify that the manager
deployment, services, and certificates are properly configured and ready.

Changes:
- Add test-connection.yaml template that scaffolds Helm test resources
  (ServiceAccount, Role, RoleBinding, and test Pod)
- Test Pod verifies manager deployment availability, metrics service,
  webhook service (when enabled), and certificates (when cert-manager enabled)
- Update GitHub Actions workflows to run helm test after installation
- Add --wait --timeout 300s flags to helm install for proper synchronization
- Fix metrics certificate DNS names to use root context ($) instead of
  current context (.) to prevent template rendering issues
- Update .gitignore to track dist/chart files in testdata projects
- Update documentation and help text

The test Pod uses bitnami/kubectl image and includes proper RBAC permissions
to check deployments, services, and certificates. Tests are automatically
cleaned up after completion via helm.sh/hook-delete-policy annotation.

This improves CI/CD reliability by catching deployment issues early and
provides a standardized testing approach for Helm chart validation.

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