Allow experiment type to be set in 7_2_X

Remi Mommsen discovered that there is no way to set the ExperimentType data member in ProducerSourceBase, which is the base class of FRDStreamSource.
This pull request fixes this problem in 7_2_X.
Remi requested the problem be fixed in 7_2_X and 7_3_X.
A separate pull request (#6416) was used for 7_3_X.
The member function setRunAndEventInfo() needed an additional argument.
All classes inheriting from ProducerSourceBase needed this addtional argument added.
At the moment, only FRDStreamSource actually sets the ExperimentType (done in this pull request).