trivy-operator integration with kube-enforcer

[KiranBodipi]

With this change, we are replacing starboard operator with trivy operator

1. We have updated kube_enforcer,kube_enforcer_advanced manifest files with Trivy Operator Resources
2. Moved starboard manifest files to kube_enforcer_starbaord and kube_enforcer_advanced_starboard
3. Upgraded trivy-operator version with latest (0.20.1) as the existing version has critical vulnerabilities
4. Added CONTROLLER_CACHE_SYNC_TIMEOUT to trivy deployment config manifest to avoid CRD sync issue
5. Upgraded kube-bench version with latest (v0.7.3)
6. Updated relevant gen_ke_certs.sh and readme files