ci: don't run wba test on PR

wba test requires secrets read to run.
But we don't want to exposes secrets on external contributions.
So it's easier to run it only after PR merged.

.github/workflows/e2e-test.yml

@@ -179,6 +179,9 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
 
+    # Don't execute on PR
+    if: github.event_name != 'pull_request'
+
     steps:
       - uses: actions/checkout@v6
         with: