Install upstream_resources layer in e2e tests, which will ensure Gateway APIs are installed. The Makefile was changed to not deploy envoy-gateway to the standard cluster during prepare-e2e, which results in this need.

Author: joshlreese

config/e2e/kustomization.yaml

@@ -2,7 +2,7 @@ namespace: network-services-operator-system
 namePrefix: network-services-operator-
 
 resources:
-  - ../crd
+  - ../upstream_resources
   - ../rbac
   - ../manager
   - ../certmanager