OZG-3530 [vorgang-manager-interface] rename directory

vorgang-manager-interface/src/main/protobuf/statistic.proto

...ng-manager-interface/src/main/protobuf/system.model.proto

vorgang-manager-interface/src/main/protobuf/system.proto

...g-manager-interface/src/main/protobuf/vorgang.model.proto

vorgang-manager-interface/src/main/protobuf/vorgang.proto

...terface/src/main/protobuf/vorgangattacheditem.model.proto

...ger-interface/src/main/protobuf/vorgangattacheditem.proto