Bug 33270: Add record_strip_nonxml routine to Koha::Biblio::Metadata

Bug 33270: Add record_strip_nonxml routine to Koha::Biblio::Metadata

This adds a routine that can strip non xml characters form a record.
It is intended for cases where we do not wish to throw an exception,
but rather need to process a record to allow other work to continue

To test:
prove -v t/db_dependent/Koha/Biblio/Metadata.t

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 4997d59c83ec1c63a3dc2c089fed79e3ad5fa764)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>