Error handling: Send email via Gmail on execution or trigger-level errors

This error handling workflow emails detailed notifications on workflow execution and trigger errors. It extends Send email via Gmail on workflow error template by covering trigger-level errors. Features Get notifications on both main workflow trigger and execution time errors. Subject line will have failed workflow id, name, error source (execution or trigger), error message. Body will contain links to both failed and error handling workflows as well as execution or trigger-level error details. Body will also contain a machine readable and enriched JSON from Error Trigger describing the error. Use this error handling workflow for as many workflows as you need. Configiration Copy this workflo

Help me set up the n8n workflow "Error handling: Send email via Gmail on execution or trigger-level errors" (https://n8n.io/workflows/3075). It uses: Gmail, Code, HTML. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.