chore(workflow): Run playwright tests for release branch PRs. (#5515)

.github/workflows/playwright.yml

@@ -1,7 +1,7 @@
 name: Playwright Tests
 on:
   pull_request:
-    branches: [master]
+    branches: [master, release/*]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}