Add playwright tests for links and slots in vue nodes mode (#5668)

Tests added
- Should show a link dragging out from a slot when dragging on a slot
- Should create a link when dropping on a compatible slot
- Should not create a link when dropping on an incompatible slot(s)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5668-Add-playwright-tests-for-links-and-slots-in-vue-nodes-mode-2736d73d36508188a47dceee5d1a11e5)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

browser_tests/tests/vueNodes/NodeHeader.spec.ts

@@ -6,7 +6,7 @@ import { VueNodeFixture } from '../../fixtures/utils/vueNodeFixtures'
 
 test.describe('NodeHeader', () => {
   test.beforeEach(async ({ comfyPage }) => {
-    await comfyPage.setSetting('Comfy.UseNewMenu', 'Enabled')
+    await comfyPage.setSetting('Comfy.UseNewMenu', 'Top')
     await comfyPage.setSetting('Comfy.Graph.CanvasMenu', false)
     await comfyPage.setSetting('Comfy.EnableTooltips', true)
     await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)