chore: poll existing e2e workflows less frequently to avoid api limits

Author: dphang

.github/workflows/e2e-tests.yml

@@ -162,7 +162,7 @@ jobs:
       - name: Wait for existing workflow to complete before e2e tests
         uses: softprops/turnstyle@v1
         with:
-          poll-interval-seconds: 15
+          poll-interval-seconds: 30
           same-branch-only: false
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}