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/Floating_Nodes.json

@@ -4,7 +4,7 @@
     {
       "parameters": {},
       "id": "d0eda550-2526-42a1-aa19-dee411c8acf9",
-      "name": "When clicking \"Execute Workflow\"",
+      "name": "When clicking \"Test Workflow\"",
       "type": "n8n-nodes-base.manualTrigger",
       "typeVersion": 1,
       "position": [
@@ -91,7 +91,7 @@
   ],
   "pinData": {},
   "connections": {
-    "When clicking \"Execute Workflow\"": {
+    "When clicking \"Test Workflow\"": {
       "main": [
         [
           {