Fix RemoveStudentAction after API token overhaul

A change in how core API classes handle made it necessary for
RemoveStudentAction to send a token when calling ApiEnlist
internally.

See I2793a3f2dd64a4bebb0b4d065e09af1e9f63fb89.

Change-Id: Ic5cf342bbb5ea2c89a1236b256ce86b3419992c8
Bug: 70748
Merge "Fix RemoveStudentAction after API token overhaul"