Fix issue on get_extrn_lbcs when FCST_LEN_HRS>=40 with netcdf

[chan-hoo]

DESCRIPTION OF CHANGES:

• Update the python script 'retrieve_data.py' to check the 'b' file on HPSS.
• Add a new WE2E test.

TESTS CONDUCTED:

• WE2E tests on Hera: MET_verification get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_grib2_2019061200 get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_grib2_2020022600 get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_grib2_2021010100 get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_nemsio_2019061200 get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_netcdf_2021062000 get_from_HPSS_ics_FV3GFS_lbcs_FV3GFS_fmt_netcdf_2022060112_48h get_from_HPSS_ics_GSMGFS_lbcs_GSMGFS get_from_HPSS_ics_HRRR_lbcs_RAP get_from_HPSS_ics_RAP_lbcs_RAP 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_25km_ics_HRRR_lbcs_HRRR_suite_RRFS_v1beta

ISSUE:

Fixes issue mentioned in #813

CONTRIBUTORS:

[chan-hoo]

@danielabdi-noaa , @christinaholtNOAA, I am not sure that this is the best solution for this issue. Please let me know what you think.

[danielabdi-noaa]

@chan-hoo It looks good to me, although I will differ to Christina since she wrote the script.