Envoy Gateway doesn't work with Knative

[dprotaso]

This is a tracking issue for an upstream bug that breaks traffic splitting - envoyproxy/gateway#5230

/triage accepted

[arkodg]

should be resolved, can you try again @dprotaso ?
also can we update

net-gateway-api/hack/test-env.sh

Line 23 in 58602c7

export ENVOY_GATEWAY_VERSION="v1.2.5"

to use v0.0.0-latest so its easier to track any regression in the future