tests: set timeout on test-ui (#17549)

This seems to finish in about 20 minutes, or run for 6+ hours until hitting
a default timeout. Set a timeout to 30 minutes so we aren't wasting time
and runners.

.github/workflows/test-ui.yml

@@ -38,6 +38,7 @@ on:
 jobs:
   test-ui:
     runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
       - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
       - name: yarn install