add more validation on rewrite-target#8743

vepatel merged 2 commits intorelease-5.3nginx/kubernetes-ingress:release-5.3from

cherry-pick-release-5.3-616c4ce6883215bc26e301b51dce2e57e3239cc4nginx/kubernetes-ingress:cherry-pick-release-5.3-616c4ce6883215bc26e301b51dce2e57e3239cc4Copy head branch name to clipboard