Bug 18951: Create data for TransformKohaToMarc.t

Bug 18951: Create data for TransformKohaToMarc.t

Adding schema and caching statements.
Adjust it so that the Koha to MARC mappings are not assumed to be present,
but are created as needed.
Remove the mock on marcflavour. It is no longer needed.
Resolving a small typo.

Test plan:
Run t/db_dependent/Biblio/TransformKohaToMarc.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit f839955db707415368d23ae81bdb14505dd058ee)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>