add a new integration test to test neutral proto particles
There will be a change in neutral additional info in proto particles where additional info will be replaced by a neutral PID, LHCb!4097 (merged). This MR adds a test for B2eegamma line.
Needs DaVinci!953 (merged) Moore!2636 (merged) LHCb!4275 (merged)
Edited by Sevda Esen