Cron list should show user

Currently `ee cron list` does not show the user command is being run as.

```
+----+------------------------+---------------------------------------------------------------------------------------------------------------------------------+----------------+
| id | site_url | command | schedule |
+----+------------------------+---------------------------------------------------------------------------------------------------------------------------------+----------------+
| 2 | www.greaterkashmir.com | sh -c 'wp cron event run --due-now' | 0 1/10 * * * * |
+----+------------------------+---------------------------------------------------------------------------------------------------------------------------------+----------------+
```

It should also show a user column which would describe value of `--user` parameter passed while creating a site.

Start at the `ee cron list` command and trace how the `--user` value is stored when creating a site. Update the list output to include a user column showing that value, then verify the displayed table matches the command's expected output.

Written by the indexing model from the issue text.