refactor

CMakeModules/testing_go.cmake

broker/CMakeLists.txt

broker/src/hidra2_broker/database/database.go

broker/src/hidra2_broker/database/database_test.go

broker/src/hidra2_broker/database/mock_database.go

broker/src/hidra2_broker/database/mongodb.go

broker/src/hidra2_broker/database/mongodb_test.go

broker/src/hidra2_broker/server/get_next.go

broker/src/hidra2_broker/server/get_next_test.go

broker/src/hidra2_broker/utils/helpers.go