Remove dependency to StringInfo in xlogbackup.{c.h}

Michael Paquier <michael@paquier.xyz>

Commit: e1e6f8f3dfe141839220875270a81ad3a719e0b6
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-09-27T00:15:07Z
Releases: 16.0
Remove dependency to StringInfo in xlogbackup.{c.h}

This was used as the returned result type of the generated contents for
the backup_label and backup history files.  This is replaced by a simple
string, reducing the cleanup burden of all the callers of
build_backup_content().

Reviewed-by: Bharath Rupireddy
Discussion: https://postgr.es/m/YzERvNPaZivHEKZJ@paquier.xyz

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