chore: clean up handling of nil batch on startup (#1890)

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## Overview

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On start up, for a new rollup or restarting an existing rollup, it is
common or expected for there to be no txns to process.
Currently this triggers an error every time which is unnecessary.
Additionally, there are plenty of situations were there are no txns to
process and that is ok.

This PR changes the error log to an info log.

```
I[2024-10-29|09:27:02.127] Creating and publishing block                module=BlockManager height=1
E[2024-10-29|09:27:02.127] error while publishing block                 module=BlockManager error="failed to get transactions from batch: no batch to process"
I[2024-10-29|09:27:03.127] Creating and publishing block                module=BlockManager height=1
```

```
I[2024-10-29|09:27:16.852] Started node                                 module=main 
I[2024-10-29|09:27:16.853] Creating and publishing block                module=BlockManager height=11
E[2024-10-29|09:27:16.853] error while publishing block                 module=BlockManager error="failed to get transactions from batch: no batch to process"
I[2024-10-29|09:27:17.853] Creating and publishing block                module=BlockManager height=11
```

After
```
I[2024-10-29|09:32:03.615] Creating and publishing block                module=BlockManager height=1
I[2024-10-29|09:32:03.615] no batch to process                          module=BlockManager  
I[2024-10-29|09:32:04.615] Creating and publishing block                module=BlockManager height=1
```

```
I[2024-10-29|09:35:09.721] Started node                                 module=main 
I[2024-10-29|09:35:09.721] Creating and publishing block                module=BlockManager height=6
I[2024-10-29|09:35:09.721] no batch to process                          module=BlockManager 
I[2024-10-29|09:35:10.722] Creating and publishing block                module=BlockManager height=6
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Bug Fixes**
- Enhanced error handling for block publishing when no transactions are
available, preventing unnecessary block creation attempts.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: MSevey

block/manager.go

@@ -1074,10 +1074,13 @@ func (m *Manager) publishBlock(ctx context.Context) error {
 		}
 
 		txs, timestamp, err := m.getTxsFromBatch()
-		if err != nil {
-			m.logger.Debug("waiting for transactions to include in block or empty batch", "height", newHeight, "details", err)
+		if errors.Is(err, ErrNoBatch) {
+			m.logger.Info(err.Error())
 			return nil
 		}
+		if err != nil {
+			return fmt.Errorf("failed to get transactions from batch: %w", err)
+		}
 		// sanity check timestamp for monotonically increasing
 		if timestamp.Before(lastHeaderTime) {
 			return fmt.Errorf("timestamp is not monotonically increasing: %s < %s", timestamp, m.getLastBlockTime())