[PSM Interop] Include app net test to the PSM Interop LB suite (#33620)

ref b/288578634

tools/internal_ci/linux/grpc_xds_k8s_lb.sh

@@ -169,7 +169,17 @@ main() {
   cd "${TEST_DRIVER_FULL_DIR}"
   local failed_tests=0
   run_alpha_test subsetting_test || (( ++failed_tests ))
-  test_suites=("api_listener_test" "change_backend_service_test" "failover_test" "remove_neg_test" "round_robin_test" "affinity_test" "outlier_detection_test" "custom_lb_test")
+  test_suites=(
+    "app_net_test"
+    "affinity_test"
+    "api_listener_test"
+    "change_backend_service_test"
+    "custom_lb_test"
+    "failover_test"
+    "outlier_detection_test"
+    "remove_neg_test"
+    "round_robin_test"
+  )
   for test in "${test_suites[@]}"; do
     run_test $test || (( ++failed_tests ))
   done

tools/internal_ci/linux/grpc_xds_k8s_lb_python.sh

@@ -174,7 +174,15 @@ main() {
   # Run tests
   cd "${TEST_DRIVER_FULL_DIR}"
   local failed_tests=0
-  test_suites=("api_listener_test" "change_backend_service_test" "failover_test" "remove_neg_test" "round_robin_test" "outlier_detection_test")
+  test_suites=(
+    "app_net_test"
+    "api_listener_test"
+    "change_backend_service_test"
+    "failover_test"
+    "outlier_detection_test"
+    "remove_neg_test"
+    "round_robin_test"
+  )
   for test in "${test_suites[@]}"; do
     run_test $test || (( ++failed_tests ))
   done