cosmic digitizer parameters within the mixing module

Backport of PR#5675  to 72X
Context: the cosmic digitizer was not included within the mixing module since 62X - This is adressed with this PR

72X was the last cycle in 7XX not fixed ( now needed also in 72X as we will produce MC cosmic with this cycle as requested by MUO.

For the record:
70X fixed with #5582
71X fixed with #5673 
73X fixed with #5675