Requested that we add the creation of the manifest.xlsx file from the data frame.

Between lines 195 and 196 (after the creation of the batch dirs) it was requested that we dump the data frame into xlsx.  The file should be named manifest.xlsx in the batch directory.

```
# Export the DataFrame to an Excel file named 'manifest.xlsx'
df.to_excel('{batch_directory}/manifest.xlsx', index=False)
```



