Backport of Add stricter validation and some normalization code for API Gateway ConfigEntries into release/1.15.x#16317

andrewstucki merged 2 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

manual-backport-api-gateway-stricter-validationhashicorp/consul:manual-backport-api-gateway-stricter-validationCopy head branch name to clipboard