Rename beacon tag (#34015)

GitOrigin-RevId: e36e5a25ccb689068141d8d823eee42b2b4e4bf0

Author: nipunn1313

self-hosted/run_backend.sh

@@ -34,6 +34,6 @@ exec ./convex-local-backend "$@" \
     --site-proxy-port 3211 \
     --convex-origin "$CONVEX_CLOUD_ORIGIN" \
     --convex-site "$CONVEX_SITE_ORIGIN" \
-    --beacon-tag "self-host-docker" \
+    --beacon-tag "self-hosted-docker" \
     "${DB_FLAGS[@]}" \
     "$DB_SPEC"