Bug 30394: Unit tests

Bug 30394: Unit tests

This patch adds tests for checking the x-koha-request-id header is
returned on GET routes that have it enabled, and then the request
includes it.

To test:
1. Apply this patch
2. Run:
   $ kshell
  k$ prove t/db_dependent/api/v1/query.t
=> FAIL: The feature is not implemented, tests fail

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>