feat(editor): Update copy: Execute --> Test (#8137)

## Summary

Title self explanatory


## Related tickets and issues
https://linear.app/n8n/issue/ADO-129/update-copy-execute-test

## Review / Merge checklist
- [x] PR title and summary are descriptive. **Remember, the title
automatically goes into the changelog. Use `(no-changelog)` otherwise.**
([conventions](https://github.com/n8n-io/n8n/blob/master/.github/pull_request_title_conventions.md))

cypress/fixtures/Test_workflow_webhook_with_pin_data.json

@@ -4,7 +4,7 @@
       {
         "parameters": {},
         "id": "0a60e507-7f34-41c0-a0f9-697d852033b6",
-        "name": "When clicking \"Execute Workflow\"",
+        "name": "When clicking \"Test Workflow\"",
         "type": "n8n-nodes-base.manualTrigger",
         "typeVersion": 1,
         "position": [
@@ -93,7 +93,7 @@
       ]
     },
     "connections": {
-      "When clicking \"Execute Workflow\"": {
+      "When clicking \"Test Workflow\"": {
         "main": [
           [
             {
@@ -148,4 +148,4 @@
       "instanceId": "021d3c82ba2d3bc090cbf4fc81c9312668bcc34297e022bb3438c5c88a43a5ff"
     },
     "tags": []
-  }
+  }