Bug 24295: Finally remove GetTransfers from C4/Circulation

Bug 24295: Finally remove GetTransfers from C4/Circulation

This patch handles the final removal of GetTransfers from
C4::Circulation.

Test plan
1/ Check that there is no mention of the GetTransfers method codebase
wide now
2/ Run the circulation and transfers tests and check nothing fails..
perhaps even run the full test suit in k-t-d
3/ Signoff

Rebased-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>