Bug 22071: Regression tests

Bug 22071: Regression tests

The authenticate_api_request() behaviour needs more tests. This patch
adds tests for the stashed Koha::Patron object. It highlights the bug in
the OAuth authentication case.

To test:
- Apply this patch
- Run:
  $ kshell
 k$ prove t/db_dependent/api/v1/auth_authenticate_api_request.t
=> FAIL: Tests fail in the OAuth case, pass in the cookie-based auth
case.

Signed-off-by: Charles Farmer <charles.farmer@inLibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>