fix test

Signed-off-by: Huabing (Robin) Zhao <zhaohuabing@gmail.com>

Author: zhaohuabing

test/config/envoy-gateaway-config/watch-namespaces.yaml

@@ -14,6 +14,8 @@ data:
           type: Namespaces
           namespaces:
           - envoy-gateway-system
+          - btp-cross-ns-denied
+          - btp-cross-ns-granted
           - gateway-conformance-infra
           - gateway-preserve-case-backend
           - gateway-upgrade-infra