OZG-6477 OZG-6439 Create correct type of Collaboration

...in/java/de/ozgcloud/alfa/collaboration/Collaboration.java

...a/de/ozgcloud/alfa/collaboration/CollaborationMapper.java

...gcloud/alfa/collaboration/CollaborationRemoteService.java

.../ozgcloud/alfa/collaboration/FachstelleCollaboration.java

...alfa/collaboration/OrganisationsEinheitCollaboration.java

...cloud/alfa/collaboration/CollaborationControllerTest.java

.../ozgcloud/alfa/collaboration/CollaborationMapperTest.java

...d/alfa/collaboration/CollaborationModelAssemblerTest.java

...ud/alfa/collaboration/CollaborationRemoteServiceTest.java

...ozgcloud/alfa/collaboration/CollaborationServiceTest.java

...lfa/collaboration/FachstelleCollaborationTestFactory.java

...ion/GrpcCollaborationRequestForFachstelleTestFactory.java

...llaborationRequestForOrganisationsEinheitTestFactory.java

...fa/collaboration/GrpcFindRequestsResponseTestFactory.java

...oration/OrganisationsEinheitCollaborationTestFactory.java