[CI] Guard code scanning workflows for main repo only

.github/workflows/codeql.yml

@@ -18,6 +18,7 @@ jobs:
     #   - https://gh.io/using-larger-runners
     # Consider using larger runners for possible analysis time improvements.
     runs-on: 'ubuntu-latest'
+    if: github.repository == 'spring-projects/spring-pulsar'
     timeout-minutes: 360
     permissions:
       actions: read