pgbackrest info json output doesn't show percentage complete

[ajayrahul97]

Please provide the following information when submitting an issue (feature requests or general comments can skip this):

1. pgBackRest version: 2.48

2. PostgreSQL version: 12.12

3. Operating system/version - Ubuntu 23.04.

4. Did you install pgBackRest from source or from a package? : Source

5. Please attach the following as applicable:
   pgbackrest.conf file(s)
   [seg0]
   pg1-socket-path = /tmp
   pg1-user = myadmin
   log-path = /usr/local/ajay/logs
   repo1-type = posix
   repo1-path = /home/myadmin/ajay/archive/seg0

6. Describe the issue:
   pgbackrest info --output=json does not show the pct-cplt field when a backup is in progress.
   I can see that here: https://github.com/pgbackrest/pgbackrest/blame/main/src/command/info/info.c#L243, there is a condition to specifically not include Percentage Complete for output type json. Please let me know if there is any specific reason for the condition to exist.

[jreidthompson]

See #2007. The comments explain why and recommend a means to calculate percentage complete using size and size-cplt.