Fix snapshot generation workflow (#5864)

Fixes playwright snapshot generation workflow.

Simple approach, can explore deduping the checkout later @snomiao

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5864-Fix-snapshot-generation-workflow-27e6d73d365081c8bf3bc00ac227415b)
by [Unito](https://www.unito.io)

Author: benceruleanlu

.github/workflows/test-browser-exp.yaml

@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.label.name == 'New Browser Test Expectations'
     steps:
+    - name: Checkout workflow repo
+      uses: actions/checkout@v5
     - name: Setup Frontend
       uses: ./.github/actions/setup-frontend
     - name: Cache Playwright browsers