cbbackupmgr progress bar issue with cronjobs

When a bash script running just the `cbbackupmgr backup` command is run on the terminal, we get the progress bar as shown below:

Script started on 2020-08-11 20:25:07+0000

Backing up to 2020-08-11T20_25_07.576464767Z

Copied all data in 1s (Avg. 14.00KB/Sec) 0 items / 14.00KB

default [======================================================================================] 100.00%

Backup successfully completed

However, the progress bar gets disabled when the script is run as a CRON job. Thus the standard out of the cronjob to file results in the following output.

Script started on 2020-08-11 20:28:02+0000

Warning: Progress bar disabled because terminal width is less than 80 characters

Backup successfully completed

During the cron execution, if due to the sizing of the cluster the backup takes a long time to complete, it would be beneficial to track the progress of the backup with some sort of percentage indication.