op-proposer: Increase sendTx timeout

This increase the send transaction timeout while decreasing the transaction
creation timeout. Using idfferent timeouts is better to catch problems because
we expect different steps to take different amounts of time.

op-proposer/proposer/l2_output_submitter.go

@@ -384,30 +384,31 @@ func (l *L2OutputSubmitter) loop() {
 	for {
 		select {
 		case <-ticker.C:
-			cCtx, cancel := context.WithTimeout(ctx, 3*time.Minute)
+			cCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
 			output, shouldPropose, err := l.FetchNextOutputInfo(cCtx)
+			cancel()
 			if err != nil {
-				l.log.Error("Failed to fetch next output", "err", err)
-				cancel()
 				break
 			}
 			if !shouldPropose {
-				cancel()
 				break
 			}
 
+			cCtx, cancel = context.WithTimeout(ctx, 30*time.Second)
 			tx, err := l.CreateProposalTx(cCtx, output)
+			cancel()
 			if err != nil {
 				l.log.Error("Failed to create proposal transaction", "err", err)
-				cancel()
 				break
 			}
+			cCtx, cancel = context.WithTimeout(ctx, 10*time.Minute)
 			if err := l.SendTransaction(cCtx, tx); err != nil {
 				l.log.Error("Failed to send proposal transaction", "err", err)
 				cancel()
 				break
+			} else {
+				cancel()
 			}
-			cancel()
 
 		case <-l.done:
 			return