Update directory structure of NCO mode

[chan-hoo]

DESCRIPTION OF CHANGES:

The directory structure of the NCO mode is updated to meet the latest version of the NCO standards (version 11.0.0, 01/19/2022).

TESTS CONDUCTED:

• WE2E tests: MET_ensemble_verification community_ensemble_2mems grid_RRFS_CONUS_13km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v16 grid_RRFS_CONUS_25km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_2017_gfdlmp_regional grid_RRFS_CONUS_25km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v15p2 grid_RRFS_CONUS_25km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v16 grid_RRFS_CONUS_25km_ics_FV3GFS_lbcs_RAP_suite_HRRR grid_RRFS_CONUS_3km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v15_thompson_mynn_lam3km grid_RRFS_CONUScompact_13km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v16 grid_RRFS_CONUScompact_25km_ics_HRRR_lbcs_HRRR_suite_RRFS_v1beta grid_RRFS_CONUScompact_25km_ics_HRRR_lbcs_RAP_suite_RRFS_v1alpha grid_RRFS_NA_3km_ics_FV3GFS_lbcs_FV3GFS_suite_RRFS_v1alpha nco_ensemble nco_grid_RRFS_CONUS_13km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v16 nco_grid_RRFS_CONUS_3km_ics_FV3GFS_lbcs_FV3GFS_suite_GFS_v15_thompson_mynn_lam3km nco_grid_RRFS_CONUScompact_25km_ics_HRRR_lbcs_RAP_suite_HRRR