Backport of api-gateway: stop adding all header filters to virtual host when generating xDS into release/1.16.x#17658

hc-github-team-consul-core merged 3 commits intorelease/1.16.xhashicorp/consul:release/1.16.xfrom

backport/api-gateway-header-filters/reasonably-wealthy-elkhashicorp/consul:backport/api-gateway-header-filters/reasonably-wealthy-elkCopy head branch name to clipboard