fix: don't throw an error when work was already processed (#1834)

Author: sergeytimoshin

forester/src/epoch_manager.rs

@@ -1248,6 +1248,10 @@ impl<R: Rpc, I: Indexer + IndexerType<R> + 'static> EpochManager<R, I> {
                 info!("Work reported");
             }
             Err(e) => {
+                if e.to_string().contains("already been processed") {
+                    info!("Work already reported for epoch {}", epoch_info.epoch.epoch);
+                    return Ok(());
+                }
                 if let RpcError::ClientError(client_error) = &e {
                     if let Some(TransactionError::InstructionError(
                         _,