test: Add JS CodeNode benchmark scenario (#10632)

packages/@n8n/benchmark/scenarios/jsCodeNodeOnceForEach/jsCodeNodeOnceForEach.manifest.json

@@ -0,0 +1,7 @@
+{
+	"$schema": "../scenario.schema.json",
+	"name": "CodeNodeJsOnceForEach",
+	"description": "A JS Code Node that runs once for each item and adds, modifies and removes properties. The data of 5 items is generated using DebugHelper Node, and returned with RespondToWebhook Node.",
+	"scenarioData": { "workflowFiles": ["jsCodeNodeOnceForEach.json"] },
+	"scriptPath": "jsCodeNodeOnceForEach.script.js"
+}