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))

packages/editor-ui/src/views/NodeView.vue

@@ -126,7 +126,7 @@
 							:loading="workflowRunning"
 							:label="runButtonText"
 							size="large"
-							icon="play-circle"
+							icon="flask"
 							type="primary"
 							:disabled="isExecutionDisabled"
 							data-test-id="execute-workflow-button"