Benchmarks using ddsim instead of npsim

eg: https://github.com/eic/physics_benchmarks/blob/9a878fba92d0a40d1cbd7dc52f6bdb1d84dccf08/benchmarks/dis/Snakefile#L19

Using `ddsim` does not enable Cherenkov photons. This is fine for now (we're using the LUT), but will cause issues down the line.

Solution: replace `ddsim` with `npsim`. Also consider updating the `npsim` setup to be consistent with [what the Productions WG uses](https://github.com/eic/simulation_campaign_hepmc3/blob/12c4b0b5e332538307bca130810c82fde0a2a308/scripts/run.sh#L140).