[Backport release/3.1.x] deduplicate nil-weight targets (#5946)#6025

randmonkey merged 2 commits intorelease/3.1.xKong/kubernetes-ingress-controller:release/3.1.xfrom

backport-5946-to-release/3.1.xKong/kubernetes-ingress-controller:backport-5946-to-release/3.1.xCopy head branch name to clipboard