Backport of [API Gateway] Fix trust domain for external peered services in synthesis code into release/1.16.x#17616

hc-github-team-consul-core merged 2 commits intorelease/1.16.xhashicorp/consul:release/1.16.xfrom

backport/net-4399/api-gateway-fix-peer-discoverychain-synthesis/rarely-sound-bearhashicorp/consul:backport/net-4399/api-gateway-fix-peer-discoverychain-synthesis/rarely-sound-bearCopy head branch name to clipboard