Bug 25855: (QA follow-up) Generalize hook and simplify tests

Bug 25855: (QA follow-up) Generalize hook and simplify tests

This patch generalizes the hook so it can be used by other circulation
actions.

Tests are also simplified by mocking some of the (extensive) plugin
hooks.

To test:
1. Repeat the test plan on the original patch
=> SUCCESS: All good
2. Sign off :-D

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