add team reviewers

Author: msarahan

.github/workflows/branch-migration-sync.yaml

@@ -22,3 +22,4 @@ jobs:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
           FROM_BRANCH: "main"
           TO_BRANCH: "branch-25.08"
+          TEAM_REVIEWERS: "RAPIDS/ci-codeowners"