Fix e2e test concurrency group on PR builds

Author: WVerlaek

.github/workflows/build.yml

@@ -399,7 +399,7 @@ jobs:
       image: eu.gcr.io/gitpod-core-dev/dev/dev-environment:at-node-18-17-1-gha.15610
     if: needs.configuration.outputs.with_integration_tests != ''
     concurrency:
-      group: ${{ github.ref == 'refs/heads/main' && github.run_id || github.sha }}-integration-test
+      group: ${{ needs.configuration.outputs.preview_name }}-integration-test
       cancel-in-progress: true
     steps:
       - uses: actions/checkout@v3