Bugfix on Broken GHRSST Ioda Converter

[apchoiCMD]

This PR should fix the ghrsst ioda converter in ci including;

• If there are no datetime available then should be 0
• Add an additional filter to avoid to append unnecessary obs. and datetime
• New ctest sub-sample was added with the case above.
• fixes #995

[emcbot]

Automated Global-Workflow GDASApp Testing Results: Machine: orion

Start: Thu Mar 28 14:50:13 CDT 2024 on Orion-login-1.HPC.MsState.Edu
---------------------------------------------------
Build:                                 *SUCCESS*
Build: Completed at Thu Mar 28 15:42:20 CDT 2024
---------------------------------------------------
Tests:                                  *Failed*
Tests: Failed at Thu Mar 28 16:09:14 CDT 2024
Tests: 89% tests passed, 6 tests failed out of 53
    1737 - test_gdasapp_fv3jedi_fv3inc (Failed)
    1771 - test_gdasapp_atm_jjob_var_run (Failed)
    1772 - test_gdasapp_atm_jjob_var_final (Failed)
    1773 - test_gdasapp_atm_jjob_ens_init (Failed)
    1774 - test_gdasapp_atm_jjob_ens_run (Failed)
    1775 - test_gdasapp_atm_jjob_ens_final (Failed)
Tests: see output at /work2/noaa/stmp/cmartin/CI/GDASApp/workflow/PR/1004/global-workflow/sorc/gdas.cd/build/log.ctest

[emcbot]

Automated Global-Workflow GDASApp Testing Results: Machine: hera

Start: Thu Mar 28 20:00:20 UTC 2024 on hfe11
---------------------------------------------------
Build:                                 *SUCCESS*
Build: Completed at Thu Mar 28 20:53:10 UTC 2024
---------------------------------------------------
Tests:                                  *Failed*
Tests: Failed at Thu Mar 28 21:58:24 UTC 2024
Tests: 85% tests passed, 8 tests failed out of 53
    1736 - test_gdasapp_fv3jedi_fv3inc (Failed)
    1757 - test_gdasapp_soca_JGDAS_GLOBAL_OCEAN_ANALYSIS_VRFY (Failed)
    1770 - test_gdasapp_atm_jjob_var_run (Failed)
    1771 - test_gdasapp_atm_jjob_var_final (Failed)
    1772 - test_gdasapp_atm_jjob_ens_init (Failed)
    1773 - test_gdasapp_atm_jjob_ens_run (Failed)
    1774 - test_gdasapp_atm_jjob_ens_final (Failed)
Tests: see output at /scratch1/NCEPDEV/da/Cory.R.Martin/CI/GDASApp/workflow/PR/1004/global-workflow/sorc/gdas.cd/build/log.ctest