ci: Enable l7 proxy for cilium nightly pipeline

Co-authored-by: vipul-21 <[email protected]>

Author: Copilot

test/integration/manifests/cilium/cilium-nightly-config.yaml

@@ -31,7 +31,7 @@ data:
   enable-ipv6-masquerade: "false"
   enable-k8s-terminating-endpoint: "true"
   enable-l2-neigh-discovery: "true"
-  enable-l7-proxy: "false"
+  enable-l7-proxy: "true"
   enable-local-node-route: "false"
   enable-local-redirect-policy: "true" # set to true for lrp test
   enable-metrics: "true"