OZG-6477 OZG-6439 Find collaborations using remote service

alfa-service/pom.xml

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

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

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

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

...fa/collaboration/GrpcCollaborationRequestTestFactory.java

...lfa/collaboration/GrpcFindRequestsRequestTestFactory.java

...fa/collaboration/GrpcFindRequestsResponseTestFactory.java

pom.xml