Remove duplicated project ids before performing sync

app/workers/geo_repository_sync_worker.rb

@@ -60,7 +60,7 @@ class GeoRepositorySyncWorker
       first.zip(second)
     else
       second.zip(first).map(&:reverse)
-    end.flatten(1).compact.take(BATCH_SIZE)
+    end.flatten(1).uniq.compact.take(BATCH_SIZE)
   end
 
   def over_time?(start_time)

spec/workers/geo_repository_sync_worker_spec.rb

@@ -26,7 +26,15 @@ describe GeoRepositorySyncWorker do
         last_repository_successful_sync_at: nil
       )
 
-      expect(Geo::RepositorySyncService).to receive(:new).twice.and_return(spy)
+      Geo::ProjectRegistry.create(
+        project: project_2,
+        last_repository_synced_at: DateTime.now,
+        last_repository_successful_sync_at: DateTime.now,
+        resync_repository: false,
+        resync_wiki: false
+      )
+
+      expect(Geo::RepositorySyncService).to receive(:new).once.and_return(spy)
 
       subject.perform
     end