Allow access to other groups for special roles like school management

Gibt's ne Möglichkeit, wie der Schulleiter/die Stufenleiter Zugriff auf alle Klassenbücher bekommen können??

added part::backend part::frontend source::customer::kath type::feature workflow::current-todo labels

assigned to @yuha

created branch 335-allow-access-to-other-groups-for-special-roles-like-school-management to address this issue

mentioned in merge request !462

changed milestone to /AlekSIS%"[NLnet #6 (closed)] Fix bugs/missing small features from pilot schools"

changed milestone to /AlekSIS%"[NLnet #6 (closed)] Do integration/final tests with pilot schools"