chore: make PR assignment workflow non-blocking on failure (#8682)

* feat: expand googler check in auto-assignment to GoogleCloudPlatform and googleapis orgs

* chore: make pr assignment workflow non-blocking on failure

Author: shivanee-p

.github/workflows/assign-reviewers.yml

@@ -14,6 +14,7 @@ jobs:
     if: github.event.pull_request.draft == false
     steps:
       - name: Assign Reviewers
+        continue-on-error: true
         uses: actions/github-script@v7
         with:
           github-token: ${{ secrets.GOOGLER_CHECK_TOKEN || secrets.GITHUB_TOKEN }}