After reviewing the existing GWAPI e2e tests for GatewayAPIController featuregate and QE new designed cases in Polarion, we will cover below tests in Origin e2e:

#1 OSSM installation succeed (check related resources) and default gatewayclass is accepted.
#2 can create and delete custom gatewayclass (delete custom should not affect default and istiod-openshift-gateway)
#3 Gateway object could be created (check LoadBalancer service, DNSRecords)
#4 HTTPRoute object could be created (using separated gateway)
#5 (negative) The OSSM related resource gets recreated after delete it (Subscription, Istio)
#6 (negative) The Gateway related resource gets recreated after delete it (LoadBalancer service, DNSRecords...)