Backport of mesh: add validation hook to proxy configuration into release/1.17.x#19209

hc-github-team-consul-core merged 6 commits intorelease/1.17.xhashicorp/consul:release/1.17.xfrom

backport/ishustava/NET-5074-proxy-config-validation-mutation/forcibly-eminent-leopardhashicorp/consul:backport/ishustava/NET-5074-proxy-config-validation-mutation/forcibly-eminent-leopardCopy head branch name to clipboard