feat(conformance): add conformance test for verifying x-gateway-destination-endpoint-served#1862

k8s-ci-robot merged 2 commits intokubernetes-sigs:mainkubernetes-sigs/gateway-api-inference-extension:mainfrom

zetxqx:verifyenpointservedzetxqx/gateway-api-inference-extension:verifyenpointservedCopy head branch name to clipboard