The pallet duniter-test-parameters seems to be only used to simplify the testing for gdev runtime for example. It allows to define some parameters directly in the genesis (for example the wot-related parameters) instead of runtime. Therefore I think it should not be used in gtest and g1 runtimes which should instead use runtime constants.
@tuxmain do you confirm? If you do not know, I’ll ask @elois.
This is part of the process of preparing gtest runtime.
[edit] in addition there is ParamsAppliedAtGenesis which seems redundant to me.