test(e2e): reenable Gateway API conformance tests

Signed-off-by: Mike Beaumont <mjboamail@gmail.com>

test/e2e/gateway/gatewayapi/conformance_test.go

@@ -103,10 +103,6 @@ func TestConformance(t *testing.T) {
 	for _, test := range tests.ConformanceTests {
 		switch test.ShortName {
 		case tests.HTTPRouteDisallowedKind.ShortName, // TODO: we only support HTTPRoute so it's not yet possible to test this
-			tests.HTTPRouteInvalidCrossNamespaceBackendRef.ShortName, // The following fail due to #4597
-			tests.HTTPRouteInvalidBackendRefUnknownKind.ShortName,
-			tests.HTTPRouteInvalidNonExistentBackendRef.ShortName,
-			tests.HTTPRoutePartiallyInvalidViaInvalidReferenceGrant.ShortName,
 			tests.TLSRouteSimpleSameNamespace.ShortName: // we don't support TLSRoute and the required feature is missing in v0.6.2: kubernetes-sigs/gateway-api#1712
 			continue
 		}