feat(benchmark): Add scenario for expressions with Set node (#10647)

packages/@n8n/benchmark/scenarios/setNodeExpressions/setNodeExpressions.script.js

@@ -0,0 +1,11 @@
+import http from 'k6/http';
+import { check } from 'k6';
+
+const apiBaseUrl = __ENV.API_BASE_URL;
+
+export default function () {
+	const res = http.post(`${apiBaseUrl}/webhook/set-expressions-benchmark`, {});
+	check(res, {
+		'is status 200': (r) => r.status === 200,
+	});
+}