Description:
test details in https://github.com/kubernetes-sigs/gateway-api/blob/main/conformance/tests/httproute-reference-grant.go
Once fixed, please enable in https://github.com/envoyproxy/gateway/blob/main/test/conformance/conformance_test.go
&
https://github.com/envoyproxy/gateway/blob/main/test/conformance/experimental_conformance_test.go

Skipped in #1987