Only sync with site-policy repo from docs-internal (#18132)

Author: rachmari

.github/workflows/site-policy-sync.yml

@@ -18,7 +18,7 @@ on:
 jobs:
   # This workflow contains a single job called "build"
   copy-file:
-    if: github.repository == 'github/docs-internal' || github.repository == 'github/docs'
+    if: github.repository == 'github/docs-internal'
     # The type of runner that the job will run on
     runs-on: ubuntu-latest