Merge multiple runs into one

This is a workflow that might come handy after using loops. They usually leave you with items spread across different "runs". The Code node in this example workflow merges them into a single run, so you have a single list of items which is often easier to work with. Simply adjust the node name inside the Code node as needed. The idea is based on this older workflow template.

Help me set up the n8n workflow "Merge multiple runs into one" (https://n8n.io/workflows/1814). It uses: Customer Datastore (n8n training), Code. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.