Implement tests for some of the sub-functions of `perform_atmospheric_chemistry_and_microphysics()`

[mjschmidt271]

The following functions that are called by perform_atmospheric_chemistry_and_microphysics() do not yet have tests.

• compute_o3_column_density()
  • Only calls utility functions and does very low-level computations
    • set_ub_col() is tested
    • setcol() is not tested, though quite simple

    void setcol(const ThreadTeam &team, const Real o3_col_deltas[mam4::nlev + 1],
        ColumnView &o3_col_dens) {
      // we can probably accelerate this with a parallel_scan, but let's just do
      // a simple loop for now
      constexpr int nlev = mam4::nlev;
      Kokkos::single(Kokkos::PerTeam(team), [=]() {
        o3_col_dens(0) = 0.5 * (o3_col_deltas[0] + o3_col_deltas[1]);
        for (int k = 1; k < nlev; ++k) {
          o3_col_dens(k) =
              o3_col_dens(k - 1) + 0.5 * (o3_col_deltas[k] + o3_col_deltas[k + 1]);
        }
      });
    }

  • Does not appear to have validation data
• gas_phase_chemistry()
  • Not tested, but all functions within are